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<?xml version="1.0" encoding="UTF-8" ?><xml><records><record><database name="stability.enl" path="/Users/sjoerd/Dropbox/Endnote library/stability.enl">stability.enl</database><source-app name="EndNote" version="18.2">EndNote</source-app><rec-number>3331</rec-number><foreign-keys><key app="EN" db-id="05zd2dwf65r5xeetapvvprt3twdpzww9we55">3331</key></foreign-keys><ref-type name="Journal Article">17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Wu, M.</style></author><author><style face="normal" font="default" size="100%">Brown, G. L.</style></author><author><style face="normal" font="default" size="100%">Woodward, J. L.</style></author><author><style face="normal" font="default" size="100%">Bruijn, S. M.</style></author><author><style face="normal" font="default" size="100%">Gordon, K. E.</style></author></authors></contributors><auth-address><style face="normal" font="default" size="100%">Department of Physical Therapy and Human Movement Sciences, Feinberg School of Medicine, Northwestern University, 645 N Michigan Ave, Suite 1100, Chicago, IL, USA.
Shirley Ryan AbilityLab, 355 E Erie, Chicago, IL, USA.
Department of Human Movement Sciences, Faculty of Behavioural and Movement Sciences, Vrije Universiteit Amsterdam, Institute for Brain and Behaviour Amsterdam and Amsterdam Movement Sciences, Amsterdam, The Netherlands.
Research Service, Edward Hines Jr. Veterans Administration Hospital, Hines, IL, USA.</style></auth-address><titles><title><style face="normal" font="default" size="100%">A novel Movement Amplification environment reveals effects of controlling lateral centre of mass motion on gait stability and metabolic cost</style></title><secondary-title><style face="normal" font="default" size="100%">R Soc Open Sci</style></secondary-title></titles><periodical><full-title><style face="normal" font="default" size="100%">R Soc Open Sci</style></full-title></periodical><pages><style face="normal" font="default" size="100%">190889</style></pages><volume><style face="normal" font="default" size="100%">7</style></volume><number><style face="normal" font="default" size="100%">1</style></number><edition><style face="normal" font="default" size="100%">2020/03/29</style></edition><keywords><keyword><style face="normal" font="default" size="100%">Movement Amplification</style></keyword><keyword><style face="normal" font="default" size="100%">centre of mass control</style></keyword><keyword><style face="normal" font="default" size="100%">locomotion</style></keyword><keyword><style face="normal" font="default" size="100%">metabolic cost</style></keyword><keyword><style face="normal" font="default" size="100%">stability</style></keyword></keywords><dates><year><style face="normal" font="default" size="100%">2020</style></year><pub-dates><date><style face="normal" font="default" size="100%">Jan</style></date></pub-dates></dates><isbn><style face="normal" font="default" size="100%">2054-5703 (Print)
2054-5703 (Linking)</style></isbn><accession-num><style face="normal" font="default" size="100%">32218932</style></accession-num><abstract><style face="normal" font="default" size="100%">During human walking, the centre of mass (COM) laterally oscillates, regularly transitioning its position above the two alternating support limbs. To maintain upright forward-directed walking, lateral COM excursion should remain within the base of support, on average. As necessary, humans can modify COM motion through various methods, including foot placement. How the nervous system controls these oscillations and the costs associated with control are not fully understood. To examine how lateral COM motions are controlled, healthy participants walked in a 'Movement Amplification' force field that increased lateral COM momentum in a manner dependent on the participant's own motion (forces were applied to the pelvis proportional to and in the same direction as lateral COM velocity). We hypothesized that metabolic cost to control lateral COM motion would increase with the gain of the field. In the Movement Amplification field, participants were significantly less stable than during baseline walking. Stability significantly decreased as the field gain increased. Participants also modified gait patterns, including increasing step width, which increased the metabolic cost of transport as the field gain increased. These results support previous research suggesting that humans modulate foot placement to control lateral COM motion, incurring a metabolic cost.</style></abstract><notes><style face="normal" font="default" size="100%">Wu, Mengnan/Mary
Brown, Geoffrey L
Woodward, Jane L
Bruijn, Sjoerd M
Gordon, Keith E
eng
England
R Soc Open Sci. 2020 Jan 15;7(1):190889. doi: 10.1098/rsos.190889. eCollection 2020 Jan.</style></notes><urls><related-urls><url><style face="normal" font="default" size="100%">https://www.ncbi.nlm.nih.gov/pubmed/32218932</style></url><url><style face="normal" font="default" size="100%">https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7029926/pdf/rsos190889.pdf</style></url></related-urls><pdf-urls><url>internal-pdf://2044897737/Wu-2020-A novel Movement Amplification environ.pdf</url></pdf-urls></urls><custom2><style face="normal" font="default" size="100%">PMC7029926</style></custom2><electronic-resource-num><style face="normal" font="default" size="100%">10.1098/rsos.190889</style></electronic-resource-num></record><record><database name="stability.enl" path="/Users/sjoerd/Dropbox/Endnote library/stability.enl">stability.enl</database><source-app name="EndNote" version="18.2">EndNote</source-app><rec-number>3343</rec-number><foreign-keys><key app="EN" db-id="05zd2dwf65r5xeetapvvprt3twdpzww9we55">3343</key></foreign-keys><ref-type name="Journal Article">17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">van Leeuwen, A.M.</style></author><author><style face="normal" font="default" size="100%">van Dieën, J.H.</style></author><author><style face="normal" font="default" size="100%">Daffertshofer, A.</style></author><author><style face="normal" font="default" size="100%">Bruijn, S.M.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Step width and frequency to modulate: Active foot placement control ensures stable gait</style></title><secondary-title><style face="normal" font="default" size="100%">bioRxiv</style></secondary-title></titles><periodical><full-title><style face="normal" font="default" size="100%">BioRxiv</style></full-title></periodical><dates><year><style face="normal" font="default" size="100%">2020</style></year><pub-dates><date><style face="normal" font="default" size="100%">2020-01-01 00:00:00</style></date></pub-dates></dates><abstract><style face="normal" font="default" size="100%">Step-by-step foot placement control, relative to the center of mass (CoM) kinematic state, is generally considered a dominant mechanism for maintenance of gait stability. By adequate (mediolateral) positioning of the center of pressure with respect to the CoM, the ground reaction force generates a moment that prevents falling. In healthy individuals, foot placement is complemented mainly by the ankle strategy ensuring stability. To evaluate possible compensatory relationships between step-by-step foot placement and complementary ankle moments, we investigated the degree of (active) foot placement control during steady-state walking and under either foot placement or ankle moment constraints. Thirty healthy participants walked on a treadmill, while full-body kinematics, ground reaction forces and EMG activities were recorded. As a replication of earlier findings, we first showed step-by-step foot placement is associated with preceding CoM state and hip ab-/adductor activity during steady-state walking. Tight control of foot placement appears to be important at normal walking speed because there was a limited change in the degree of foot placement control despite the presence of a foot placement constraint. At slow speed, the degree of foot placement control decreased substantially, suggesting that tight control of foot placement is less essential when walking slowly. Foot placement control was not tightened to compensate for constrained ankle moments. Instead compensation was achieved through increases in step width and stride frequency.Competing Interest StatementThe authors have declared no competing interest.</style></abstract><urls></urls></record><record><database name="stability.enl" path="/Users/sjoerd/Dropbox/Endnote library/stability.enl">stability.enl</database><source-app name="EndNote" version="18.2">EndNote</source-app><rec-number>3332</rec-number><foreign-keys><key app="EN" db-id="05zd2dwf65r5xeetapvvprt3twdpzww9we55">3332</key></foreign-keys><ref-type name="Journal Article">17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">van den Bogaart, M.</style></author><author><style face="normal" font="default" size="100%">Bruijn, S. M.</style></author><author><style face="normal" font="default" size="100%">van Dieen, J. H.</style></author><author><style face="normal" font="default" size="100%">Meyns, P.</style></author></authors></contributors><auth-address><style face="normal" font="default" size="100%">Rehabilitation Research Center (REVAL), Faculty of Rehabilitation Sciences, Hasselt University, Diepenbeek 3590, Belgium; MOVE Research Institute Amsterdam, Department of Human Movement Sciences, Faculty of Behavioural and Movement Sciences, Vrije Universiteit Amsterdam, Amsterdam 1081 BT, the Netherlands.
MOVE Research Institute Amsterdam, Department of Human Movement Sciences, Faculty of Behavioural and Movement Sciences, Vrije Universiteit Amsterdam, Amsterdam 1081 BT, the Netherlands; Institute Brain and Behaviour Amsterdam, Amsterdam, The Netherlands. Electronic address: [email protected].
MOVE Research Institute Amsterdam, Department of Human Movement Sciences, Faculty of Behavioural and Movement Sciences, Vrije Universiteit Amsterdam, Amsterdam 1081 BT, the Netherlands.
Rehabilitation Research Center (REVAL), Faculty of Rehabilitation Sciences, Hasselt University, Diepenbeek 3590, Belgium.</style></auth-address><titles><title><style face="normal" font="default" size="100%">The effect of anteroposterior perturbations on the control of the center of mass during treadmill walking</style></title><secondary-title><style face="normal" font="default" size="100%">J Biomech</style></secondary-title></titles><periodical><full-title><style face="normal" font="default" size="100%">J Biomech</style></full-title><abbr-1><style face="normal" font="default" size="100%">Journal of biomechanics</style></abbr-1></periodical><pages><style face="normal" font="default" size="100%">109660</style></pages><volume><style face="normal" font="default" size="100%">103</style></volume><edition><style face="normal" font="default" size="100%">2020/03/17</style></edition><keywords><keyword><style face="normal" font="default" size="100%">Ankle moments</style></keyword><keyword><style face="normal" font="default" size="100%">Center of mass acceleration</style></keyword><keyword><style face="normal" font="default" size="100%">Counter-rotation mechanism</style></keyword><keyword><style face="normal" font="default" size="100%">Foot placement</style></keyword><keyword><style face="normal" font="default" size="100%">Gait stability</style></keyword><keyword><style face="normal" font="default" size="100%">Perturbed treadmill walking</style></keyword><keyword><style face="normal" font="default" size="100%">competing financial interests or personal relationships that could have appeared</style></keyword><keyword><style face="normal" font="default" size="100%">to influence the work reported in this paper.</style></keyword></keywords><dates><year><style face="normal" font="default" size="100%">2020</style></year><pub-dates><date><style face="normal" font="default" size="100%">Apr 16</style></date></pub-dates></dates><isbn><style face="normal" font="default" size="100%">1873-2380 (Electronic)
0021-9290 (Linking)</style></isbn><accession-num><style face="normal" font="default" size="100%">32171496</style></accession-num><abstract><style face="normal" font="default" size="100%">Shifts of the center of pressure (CoP) through modulation of foot placement and ankle moments (CoP-mechanism) cause accelerations of the center of mass (CoM) that can be used to stabilize gait. An additional mechanism that can be used to stabilize gait, is the counter-rotation mechanism, i.e., changing the angular momentum of segments around the CoM to change the direction of the ground reaction force. The relative contribution of these mechanisms to the control of the CoM is unknown. Therefore, we aimed to determine the relative contribution of these mechanisms to control the CoM in the anteroposterior (AP) direction during a normal step and the first recovery step after perturbation in healthy adults. Nineteen healthy subjects walked on a split-belt treadmill and received unexpected belt acceleration perturbations of various magnitudes applied immediately after right heel-strike. Full-body kinematic and force plate data were obtained to calculate the contributions of the CoP-mechanism and the counter-rotation mechanism to control the CoM. We found that the CoP-mechanism contributed to corrections of the CoM acceleration after the AP perturbations, while the counter-rotation mechanism actually counteracted the CoM acceleration after perturbation, but only in the initial phases of the first step after the perturbation. The counter-rotation mechanism appeared to prevent interference with the gait pattern, rather than using it to control the CoM after the perturbation. Understanding the mechanisms used to stabilize gait may have implications for the design of therapeutic interventions that aim to decrease fall incidence.</style></abstract><notes><style face="normal" font="default" size="100%">van den Bogaart, Maud
Bruijn, Sjoerd M
van Dieen, Jaap H
Meyns, Pieter
eng
J Biomech. 2020 Apr 16;103:109660. doi: 10.1016/j.jbiomech.2020.109660. Epub 2020 Jan 24.</style></notes><urls><related-urls><url><style face="normal" font="default" size="100%">https://www.ncbi.nlm.nih.gov/pubmed/32171496</style></url><url><style face="normal" font="default" size="100%">https://pdf.sciencedirectassets.com/271132/1-s2.0-S0021929020X00066/1-s2.0-S0021929020300671/main.pdf?X-Amz-Security-Token=IQoJb3JpZ2luX2VjEHYaCXVzLWVhc3QtMSJHMEUCIDvGAuRndPJe%2FWROLn53Dga5nrdNB7JMSVFywzx56TibAiEA6%2BWz3Lp3xZUoxTK3b0gGebn7XO4yzm0rH8wJbgzKbUcqtAMILxADGgwwNTkwMDM1NDY4NjUiDFuSRJDtGElzr61iryqRA0aIccelxHXm0MwdMAiHRSzJj2ldr8qpgQiQsNE1JvgYbWx4xKOOwTyA%2FBCdsYTyp48pfNcuy%2BhrkcikCw8zGewB3GhOPF6TXGaTs4E7MqI4GX3V%2BZHJDlsXSq318ht0zHJDSUKGptWU3WvW6cBFwhI35qX6v12JokDpPtYtw5jv7dv0SbP0Q%2F1ra%2Bx0yyKNgVWPb8izjcP2Uie2LQNa8LZbuLY4t%2FlhzH%2BDtpI5HNT8NsA4BWdaiDV9v%2FWpA8TfUb07JIBYRc7W0v3%2B%2F9ju%2FXvk1CR5hnWUTYeRUtrYhb6TQJcMTsKAV7tm6kXIG8U%2BdRF0NN5HexhVR5m9CKBK9hEEghmtt7MrY3At9OrAeHkDeez2TOo9sdgKBp4W8GndmXhRs3jaIZ5AIAYHMd%2Bq0RF2hzkSH%2FycytsHjR542sj2jCdgp8NJTrvVePjPVwgvjgV4kfsTDYUU3nvvM34wkpx7s2s5m2uJmBWhbX%2BCRU4QYLim5iHuEAftA8KEWmXiYgzMYfuEMUII9OJxnCQNbyJVMM651vgFOusBTDtZdGXWMMv5%2BpcDh8OwgSwuRhcCiQpXyhei88hOF2nVygtA0CYI5Wj0%2BCsxLyodGxPA7L%2FWEpii52KYQB3bcL%2FmDxUojRXo3HpjLYxGtdFcDtnYcXc7PHOmC00VDgdO6F1rVd50Uq%2BvJxZB8JheFoqO%2Bai8keeZgF1fzi22FOMAj4h4Mh1sR9LSn72kPd2%2BFTrjQDCzBBydrTnMYKe7iLaQo8%2Fzs1OxFtbXSRDCJgxVXnx9QcgxGBmalzXJDLhJP6VmX1YxoyIn6LN%2FCoUU94uBjJty%2FyyLM35va2nGsPcA7sASvHQFYWzOKQ%3D%3D&X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Date=20200720T142911Z&X-Amz-SignedHeaders=host&X-Amz-Expires=300&X-Amz-Credential=ASIAQ3PHCVTY2FJYE7EH%2F20200720%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Signature=d15e6dc73187740aef7f39bcee645cd2267019cabcf83904c9951d499de36c30&hash=105eca4989bec123fed651c35d5d3461f2c548bd55ea2eccb4a79e932f8ea6c6&host=68042c943591013ac2b2430a89b270f6af2c76d8dfd086a07176afe7c76c2c61&pii=S0021929020300671&tid=spdf-0320fe38-9554-4369-a0c4-e9cc0ac132f5&sid=67b6f89490d3f94ce86b9242a40ecea97a17gxrqb&type=client</style></url></related-urls><pdf-urls><url>internal-pdf://3829176373/van den Bogaart-2020-The effect of anteroposte.pdf</url></pdf-urls></urls><electronic-resource-num><style face="normal" font="default" size="100%">10.1016/j.jbiomech.2020.109660</style></electronic-resource-num></record><record><database name="stability.enl" path="/Users/sjoerd/Dropbox/Endnote library/stability.enl">stability.enl</database><source-app name="EndNote" version="18.2">EndNote</source-app><rec-number>3341</rec-number><foreign-keys><key app="EN" db-id="05zd2dwf65r5xeetapvvprt3twdpzww9we55">3341</key></foreign-keys><ref-type name="Journal Article">17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Mahaki, Mohammadreza</style></author><author><style face="normal" font="default" size="100%">IJmker, Trienke</style></author><author><style face="normal" font="default" size="100%">Houdijk, Han</style></author><author><style face="normal" font="default" size="100%">Bruijn, Sjoerd Matthijs</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">How does external lateral stabilization constrain normal gait, apart from improving medio-lateral gait stability?</style></title><secondary-title><style face="normal" font="default" size="100%">bioRxiv</style></secondary-title></titles><periodical><full-title><style face="normal" font="default" size="100%">BioRxiv</style></full-title></periodical><dates><year><style face="normal" font="default" size="100%">2020</style></year><pub-dates><date><style face="normal" font="default" size="100%">2020-01-01 00:00:00</style></date></pub-dates></dates><abstract><style face="normal" font="default" size="100%">Background The effect of external lateral stabilization on medio-lateral gait stability has been investigated previously. However, existing lateral stabilization devices not only constrains lateral motions, but also transverse and frontal pelvis rotations. This study aimed to investigate the effect of external lateral stabilization with and without constrained transverse pelvis rotation on mechanical and metabolic gait features.Methods We undertook 2 experiments with eleven and ten young adult subjects, respectively. Experiment 2 supplemented experiment 1, as it considered several potential confounding factors in the design and set-up of experiment 1. Kinematic, kinetic, and breath-by-breath oxygen consumption data were recorded during 3 walking conditions (normal walking (Normal), lateral stabilization with (Free) and without transverse pelvis rotation (Restricted)) and at 3 speeds (0.83, 1.25, and 1.66 m/s) for each condition.Results External lateral stabilization significantly reduced the amplitudes of the transverse and frontal pelvis rotations, medio-lateral pelvis displacement, transverse thorax rotation, arm swing, and step width. The amplitudes of free vertical moment, anterior-posterior and vertical pelvis displacements, step length, and energy cost were not significantly influenced by external lateral stabilization. The removal of transverse pelvis rotation restriction by our experimental set-up resulted in significantly higher transverse pelvis rotation, although it remained significantly less than Normal condition. In concert, concomitant gait features such as transverse thorax rotation and arm swing were not significantly influenced by our new set-up.Conclusion Existing lateral stabilization set-ups not only constrain medio-lateral motions (i.e. medio-lateral pelvis displacement), but also constrains other movements such as transverse and frontal pelvis rotations, which leads to several other gait changes such as reduced transverse thorax rotation, and arm swing. Our new setup allowed for more transverse pelvis rotation, however, this did not result in more normal pelvis rotation, arm swing, etc. Hence, to provide medio-lateral support without constraining other gait variables, more elaborate set-ups are needed. Unless such a set-up is realized the observed side effects need to be taken into account when interpreting the effects of lateral stabilization as reported in previous studies.Competing Interest StatementThe authors have declared no competing interest.</style></abstract><urls></urls></record><record><database name="stability.enl" path="/Users/sjoerd/Dropbox/Endnote library/stability.enl">stability.enl</database><source-app name="EndNote" version="18.2">EndNote</source-app><rec-number>3329</rec-number><foreign-keys><key app="EN" db-id="05zd2dwf65r5xeetapvvprt3twdpzww9we55">3329</key></foreign-keys><ref-type name="Journal Article">17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Magnani, R. M.</style></author><author><style face="normal" font="default" size="100%">Bruijn, S. M.</style></author><author><style face="normal" font="default" size="100%">van Dieen, J. H.</style></author><author><style face="normal" font="default" size="100%">Vieira, M. F.</style></author></authors></contributors><auth-address><style face="normal" font="default" size="100%">Bioengineering and Biomechanics Laboratory, Federal University of Goias, Goiania, Brazil. Electronic address: [email protected].
Department of Human Movement Sciences, Vrije Universiteit Amsterdam, Amsterdam Movement Science, Amsterdam, The Netherlands.
Bioengineering and Biomechanics Laboratory, Federal University of Goias, Goiania, Brazil.</style></auth-address><titles><title><style face="normal" font="default" size="100%">Head orientation and gait stability in young adults, dancers and older adults</style></title><secondary-title><style face="normal" font="default" size="100%">Gait Posture</style></secondary-title></titles><periodical><full-title><style face="normal" font="default" size="100%">Gait Posture</style></full-title><abbr-1><style face="normal" font="default" size="100%">Gait & posture</style></abbr-1></periodical><pages><style face="normal" font="default" size="100%">68-73</style></pages><volume><style face="normal" font="default" size="100%">80</style></volume><edition><style face="normal" font="default" size="100%">2020/06/04</style></edition><keywords><keyword><style face="normal" font="default" size="100%">Dancing</style></keyword><keyword><style face="normal" font="default" size="100%">Gait analysis</style></keyword><keyword><style face="normal" font="default" size="100%">Margins of stability</style></keyword><keyword><style face="normal" font="default" size="100%">Vestibular system</style></keyword><keyword><style face="normal" font="default" size="100%">declare.</style></keyword></keywords><dates><year><style face="normal" font="default" size="100%">2020</style></year><pub-dates><date><style face="normal" font="default" size="100%">Jul</style></date></pub-dates></dates><isbn><style face="normal" font="default" size="100%">1879-2219 (Electronic)
0966-6362 (Linking)</style></isbn><accession-num><style face="normal" font="default" size="100%">32492622</style></accession-num><abstract><style face="normal" font="default" size="100%">BACKGROUND: Control of body orientation requires head motion detection by the vestibular system and small changes with respect to the gravitational acceleration vector could cause destabilization. RESEARCH QUESTION: We aimed to compare the effects of different head orientations on gait stability in young adults, dancers and older adults. METHODS: Three groups of 10 subjects were evaluated, the first composed of young adults (aged 18-30 years), the second composed of young healthy dancers under high performance dance training (aged 18-30 years), and the third group composed of community-dwelling older adults (aged 65-80 years). Participants walked on a treadmill at their preferred speed in four distinct head orientation conditions for four minutes each: control (neutral orientation); dynamic yaw (following a target over 45 degrees bilaterally); up (15 degrees neck extension), and down (40 degrees neck flexion). Foot and trunk kinematic data were acquired using a 3D motion capture system and the gait pattern was assessed by basic gait parameters (step length, stride width and corresponding variability) and gait stability (local divergence exponents and margins of stability). Main effects of conditions and groups, as well as their interaction effects, were evaluated by repeated-measures analysis of variance. RESULTS: Interactions of group and head orientation were found for both step length and stride width variability; main effects of head orientation were found for all evaluated parameters and main effects of group were found for step length and its variability and local divergence exponents in all directions. SIGNIFICANCE: As expected, the older adults group showed less stable gait (higher local divergence exponent), the shortest step length and greater step length variability. However, contrary to expectation, the dancers were not more stable. The yaw condition was the most challenging for all groups and the down condition seemed to be least challenging.</style></abstract><notes><style face="normal" font="default" size="100%">Magnani, Rina M
Bruijn, Sjoerd M
van Dieen, Jaap H
Vieira, Marcus F
eng
England
Gait Posture. 2020 Jul;80:68-73. doi: 10.1016/j.gaitpost.2020.05.035. Epub 2020 May 25.</style></notes><urls><related-urls><url><style face="normal" font="default" size="100%">https://www.ncbi.nlm.nih.gov/pubmed/32492622</style></url><url><style face="normal" font="default" size="100%">https://www.sciencedirect.com/science/article/abs/pii/S0966636220301855?via%3Dihub</style></url></related-urls></urls><electronic-resource-num><style face="normal" font="default" size="100%">10.1016/j.gaitpost.2020.05.035</style></electronic-resource-num></record><record><database name="stability.enl" path="/Users/sjoerd/Dropbox/Endnote library/stability.enl">stability.enl</database><source-app name="EndNote" version="18.2">EndNote</source-app><rec-number>3328</rec-number><foreign-keys><key app="EN" db-id="05zd2dwf65r5xeetapvvprt3twdpzww9we55">3328</key></foreign-keys><ref-type name="Journal Article">17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Kluft, N.</style></author><author><style face="normal" font="default" size="100%">Bruijn, S. M.</style></author><author><style face="normal" font="default" size="100%">Luu, M. J.</style></author><author><style face="normal" font="default" size="100%">Dieen, J. H. V.</style></author><author><style face="normal" font="default" size="100%">Carpenter, M. G.</style></author><author><style face="normal" font="default" size="100%">Pijnappels, M.</style></author></authors></contributors><auth-address><style face="normal" font="default" size="100%">Department of Human Movement Sciences, Vrije Universiteit Amsterdam, Amsterdam Movement Sciences, Amsterdam, The Netherlands.
Institute Brain and Behaviour Amsterdam, Amsterdam, The Netherlands.
Neural Control of Posture and Movement Laboratory, School of Kinesiology, The University of British Columbia, Vancouver, BC, Canada.
Department of Human Movement Sciences, Vrije Universiteit Amsterdam, Amsterdam Movement Sciences, Amsterdam, The Netherlands. [email protected].</style></auth-address><titles><title><style face="normal" font="default" size="100%">The influence of postural threat on strategy selection in a stepping-down paradigm</style></title><secondary-title><style face="normal" font="default" size="100%">Sci Rep</style></secondary-title></titles><periodical><full-title><style face="normal" font="default" size="100%">Sci Rep</style></full-title></periodical><pages><style face="normal" font="default" size="100%">10815</style></pages><volume><style face="normal" font="default" size="100%">10</style></volume><number><style face="normal" font="default" size="100%">1</style></number><edition><style face="normal" font="default" size="100%">2020/07/04</style></edition><dates><year><style face="normal" font="default" size="100%">2020</style></year><pub-dates><date><style face="normal" font="default" size="100%">Jul 2</style></date></pub-dates></dates><isbn><style face="normal" font="default" size="100%">2045-2322 (Electronic)
2045-2322 (Linking)</style></isbn><accession-num><style face="normal" font="default" size="100%">32616778</style></accession-num><abstract><style face="normal" font="default" size="100%">To walk safely in their environment, people need to select adequate movement strategies during gait. In situations that are perceived as more threatening, older adults adopt more cautious strategies. For individuals with excessive fear, selecting adequate strategies might be troubling. We investigated how a postural threat affects the selection of strategies within and between older adults by using a stepping-down paradigm. In twenty-four older adults we determined the height at which they switched in stepping-down strategies from a less demanding but more balance threatening heel landing to a more demanding yet safer toe landing. We expected that this switching height would be lower in the high (0.78 m elevation) compared to low threat (floor level) condition. Furthermore, we investigated if older adults, for which the postural threat evoked an increase in the perceived fear, presented a different stepping down strategy due to the postural threat. Our results indicated that the postural threat changed older adults' strategies selection towards a more conservative toe landing. Hence, despite the additional effort, older adults prefer more cautious strategies during a postural threat. No effects of perceived fear on strategy selection between individuals were observed, potentially due to relatively small differences in fear among participants.</style></abstract><notes><style face="normal" font="default" size="100%">Kluft, Nick
Bruijn, Sjoerd M
Luu, M John
Dieen, Jaap H van
Carpenter, Mark G
Pijnappels, Mirjam
eng
England
Sci Rep. 2020 Jul 2;10(1):10815. doi: 10.1038/s41598-020-66352-8.</style></notes><urls><related-urls><url><style face="normal" font="default" size="100%">https://www.ncbi.nlm.nih.gov/pubmed/32616778</style></url><url><style face="normal" font="default" size="100%">https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7331803/pdf/41598_2020_Article_66352.pdf</style></url></related-urls><pdf-urls><url>internal-pdf://0719885348/Kluft-2020-The influence of postural threat on.pdf</url></pdf-urls></urls><custom2><style face="normal" font="default" size="100%">PMC7331803</style></custom2><electronic-resource-num><style face="normal" font="default" size="100%">10.1038/s41598-020-66352-8</style></electronic-resource-num></record><record><database name="stability.enl" path="/Users/sjoerd/Dropbox/Endnote library/stability.enl">stability.enl</database><source-app name="EndNote" version="18.2">EndNote</source-app><rec-number>3342</rec-number><foreign-keys><key app="EN" db-id="05zd2dwf65r5xeetapvvprt3twdpzww9we55">3342</key></foreign-keys><ref-type name="Journal Article">17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Jin, Jian</style></author><author><style face="normal" font="default" size="100%">Kistemaker, Dinant</style></author><author><style face="normal" font="default" size="100%">van Dieën, Jaap H.</style></author><author><style face="normal" font="default" size="100%">Daffertshofer, Andreas</style></author><author><style face="normal" font="default" size="100%">Bruijn, Sjoerd M.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">The validation of new phase-dependent gait stability measures: a modeling approach</style></title><secondary-title><style face="normal" font="default" size="100%">bioRxiv</style></secondary-title></titles><periodical><full-title><style face="normal" font="default" size="100%">BioRxiv</style></full-title></periodical><dates><year><style face="normal" font="default" size="100%">2020</style></year><pub-dates><date><style face="normal" font="default" size="100%">2020-01-01 00:00:00</style></date></pub-dates></dates><abstract><style face="normal" font="default" size="100%">Identification of individuals at risk of falling is important when designing fall prevention methods. Current stability measures that estimate gait stability and robustness appear limited in predicting falls in older adults. Inspired by recent findings of phase-dependent local stability changes within a gait cycle, we used compass-walker models to test several phase-dependent stability metrics for their usefulness to predict gait robustness. These metrics are closely related to the often-employed maximum finite-time Lyapunov exponent and maximum Floquet multiplier. They entail linearizing the system in a rotating hypersurface orthogonal to the period-one solution, and estimating the local divergence rate of the swing phases and the foot strikes. We correlated the metrics with the gait robustness of two compass walker models with either point or circular feet to estimate their prediction accuracy. To also test for the metrics’ invariance under coordinate transform, we represented the point-feet walker in both Euler-Lagrange and Hamiltonian canonical form. Our simulations revealed that for most of the metrics, correlations differ between models and also change under coordinate transforms, severely limiting the prediction accuracy of gait robustness. The only exception that consistently correlated with gait robustness is the divergence of foot strikes. These results admit challenges of using phase-dependent stability metrics as objective measure to quantify gait robustness.Competing Interest StatementThe authors have declared no competing interest.</style></abstract><urls></urls></record><record><database name="stability.enl" path="/Users/sjoerd/Dropbox/Endnote library/stability.enl">stability.enl</database><source-app name="EndNote" version="18.2">EndNote</source-app><rec-number>3333</rec-number><foreign-keys><key app="EN" db-id="05zd2dwf65r5xeetapvvprt3twdpzww9we55">3333</key></foreign-keys><ref-type name="Journal Article">17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Cofre Lizama, L. E.</style></author><author><style face="normal" font="default" size="100%">Bruijn, S. M.</style></author><author><style face="normal" font="default" size="100%">Galea, M. P.</style></author></authors></contributors><auth-address><style face="normal" font="default" size="100%">Department of Medicine (Royal Melbourne Hospital), University of Melbourne, Australia; Australian Rehabilitation Research Centre (ARRC), Royal Melbourne Hospital, Australia. Electronic address: [email protected].
Faculty of Behavioural and Movement Sciences, VU University Amsterdam, Amsterdam, the Netherlands.
Department of Medicine (Royal Melbourne Hospital), University of Melbourne, Australia; Australian Rehabilitation Research Centre (ARRC), Royal Melbourne Hospital, Australia; Department of Rehabiliation Medicine (Royal Melbourne Hospital), Australia.</style></auth-address><titles><title><style face="normal" font="default" size="100%">Gait stability at early stages of multiple sclerosis using different data sources</style></title><secondary-title><style face="normal" font="default" size="100%">Gait Posture</style></secondary-title></titles><periodical><full-title><style face="normal" font="default" size="100%">Gait Posture</style></full-title><abbr-1><style face="normal" font="default" size="100%">Gait & posture</style></abbr-1></periodical><pages><style face="normal" font="default" size="100%">214-217</style></pages><volume><style face="normal" font="default" size="100%">77</style></volume><edition><style face="normal" font="default" size="100%">2020/02/15</style></edition><keywords><keyword><style face="normal" font="default" size="100%">*Divergence</style></keyword><keyword><style face="normal" font="default" size="100%">*Location</style></keyword><keyword><style face="normal" font="default" size="100%">*Multiple sclerosis</style></keyword><keyword><style face="normal" font="default" size="100%">*Stability</style></keyword></keywords><dates><year><style face="normal" font="default" size="100%">2020</style></year><pub-dates><date><style face="normal" font="default" size="100%">Mar</style></date></pub-dates></dates><isbn><style face="normal" font="default" size="100%">1879-2219 (Electronic)
0966-6362 (Linking)</style></isbn><accession-num><style face="normal" font="default" size="100%">32058286</style></accession-num><abstract><style face="normal" font="default" size="100%">BACKGROUND: People at early stages of multiple sclerosis have subtle balance problems that may affect gait stability. However, differences in methods of determining stability such as sensor type and placements, may lead to different results and affect their interpretation when comparing to controls and other studies. QUESTIONS: Do people with multiple sclerosis (PwMS) exhibit lower gait stability? Do location and type of data used to calculate stability metrics affect comparisons? METHODS: 30 PwMS with no walking impairments as clinically measured and 15 healthy controls walked on a treadmill at 1.2 ms(-1) while 3D acceleration data was obtained from sacrum, shoulder and cervical markers and from an accelerometer placed at the sacrum. The local divergence exponent was calculated for the four data sources. An ANOVA with group (multiple sclerosis and control) and data source as main factors was used to determine the effect of disease, data source and their interaction on stability metrics. RESULTS: PwMS walked with significantly less stability according to all sensors (no interaction). A significant effect of data source on stability was also found, indicating that the local divergence exponent derived from sacrum accelerometer was lower than that derived from the other 3 sensor locations. SIGNIFICANCE: PwMS with no evident gait impairments are less stable than healthy controls when walking on a treadmill. Although different data sources can be used to determine MS-related stability deterioration, a consensus about location and data source is needed. The local divergence exponent can be a useful measure of progression of gait instability at early stages of MS.</style></abstract><notes><style face="normal" font="default" size="100%">Cofre Lizama, L Eduardo
Bruijn, Sjoerd M
Galea, Mary P
eng
England
Gait Posture. 2020 Mar;77:214-217. doi: 10.1016/j.gaitpost.2020.02.006. Epub 2020 Feb 5.</style></notes><urls><related-urls><url><style face="normal" font="default" size="100%">https://www.ncbi.nlm.nih.gov/pubmed/32058286</style></url><url><style face="normal" font="default" size="100%">https://www.sciencedirect.com/science/article/abs/pii/S0966636220300679?via%3Dihub</style></url></related-urls></urls><electronic-resource-num><style face="normal" font="default" size="100%">10.1016/j.gaitpost.2020.02.006</style></electronic-resource-num></record><record><database name="stability.enl" path="/Users/sjoerd/Dropbox/Endnote library/stability.enl">stability.enl</database><source-app name="EndNote" version="18.2">EndNote</source-app><rec-number>3330</rec-number><foreign-keys><key app="EN" db-id="05zd2dwf65r5xeetapvvprt3twdpzww9we55">3330</key></foreign-keys><ref-type name="Journal Article">17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Alizadehsaravi, L.</style></author><author><style face="normal" font="default" size="100%">Bruijn, S. M.</style></author><author><style face="normal" font="default" size="100%">Maas, H.</style></author><author><style face="normal" font="default" size="100%">van Dieen, J. H.</style></author></authors></contributors><auth-address><style face="normal" font="default" size="100%">Department of Human Movement Sciences, Faculty of Behavioural and Movement Sciences, Institute for Brain and Behaviour Amsterdam and Amsterdam Movement Sciences, Vrije Universiteit Amsterdam, Van der Boechorststraat 9, 1081 BT, Amsterdam, The Netherlands.
Department of Human Movement Sciences, Faculty of Behavioural and Movement Sciences, Institute for Brain and Behaviour Amsterdam and Amsterdam Movement Sciences, Vrije Universiteit Amsterdam, Van der Boechorststraat 9, 1081 BT, Amsterdam, The Netherlands. [email protected].</style></auth-address><titles><title><style face="normal" font="default" size="100%">Modulation of soleus muscle H-reflexes and ankle muscle co-contraction with surface compliance during unipedal balancing in young and older adults</style></title><secondary-title><style face="normal" font="default" size="100%">Exp Brain Res</style></secondary-title></titles><periodical><full-title><style face="normal" font="default" size="100%">Exp Brain Res</style></full-title><abbr-1><style face="normal" font="default" size="100%">Experimental brain research. Experimentelle Hirnforschung. Experimentation cerebrale</style></abbr-1></periodical><pages><style face="normal" font="default" size="100%">1371-1383</style></pages><volume><style face="normal" font="default" size="100%">238</style></volume><number><style face="normal" font="default" size="100%">6</style></number><edition><style face="normal" font="default" size="100%">2020/04/09</style></edition><keywords><keyword><style face="normal" font="default" size="100%">Aging</style></keyword><keyword><style face="normal" font="default" size="100%">Balance control</style></keyword><keyword><style face="normal" font="default" size="100%">Co-contraction</style></keyword><keyword><style face="normal" font="default" size="100%">H-reflex</style></keyword><keyword><style face="normal" font="default" size="100%">Postural control</style></keyword><keyword><style face="normal" font="default" size="100%">Spinal excitability</style></keyword></keywords><dates><year><style face="normal" font="default" size="100%">2020</style></year><pub-dates><date><style face="normal" font="default" size="100%">Jun</style></date></pub-dates></dates><isbn><style face="normal" font="default" size="100%">1432-1106 (Electronic)
0014-4819 (Linking)</style></isbn><accession-num><style face="normal" font="default" size="100%">32266445</style></accession-num><abstract><style face="normal" font="default" size="100%">This study aimed to assess modulation of lower leg muscle reflex excitability and co-contraction during unipedal balancing on compliant surfaces in young and older adults. Twenty healthy adults (ten aged 18-30 years and ten aged 65-80 years) were recruited. Soleus muscle H-reflexes were elicited by electrical stimulation of the tibial nerve, while participants stood unipedally on a robot-controlled balance platform, simulating different levels of surface compliance. In addition, electromyographic data (EMG) of soleus (SOL), tibialis anterior (TA), and peroneus longus (PL) and full-body 3D kinematic data were collected. The mean absolute center of mass velocity was determined as a measure of balance performance. Soleus H-reflex data were analyzed in terms of the amplitude related to the M wave and the background EMG activity 100 ms prior to the stimulation. The relative duration of co-contraction was calculated for soleus and tibialis anterior, as well as for peroneus longus and tibialis anterior. Center of mass velocity was significantly higher in older adults compared to young adults ([Formula: see text] and increased with increasing surface compliance in both groups ([Formula: see text]. The soleus H-reflex gain decreased with surface compliance in young adults [Formula: see text], while co-contraction increased [Formula: see text]. Older adults did not show such modulations, but showed overall lower H-reflex gains [Formula: see text] and higher co-contraction than young adults [Formula: see text]. These results suggest an overall shift in balance control from the spinal level to supraspinal levels in older adults, which also occurred in young adults when balancing at more compliant surfaces.</style></abstract><notes><style face="normal" font="default" size="100%">Alizadehsaravi, Leila
Bruijn, Sjoerd M
Maas, Huub
van Dieen, Jaap H
eng
Germany
Exp Brain Res. 2020 Jun;238(6):1371-1383. doi: 10.1007/s00221-020-05784-0. Epub 2020 Apr 7.</style></notes><urls><related-urls><url><style face="normal" font="default" size="100%">https://www.ncbi.nlm.nih.gov/pubmed/32266445</style></url><url><style face="normal" font="default" size="100%">https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7286858/pdf/221_2020_Article_5784.pdf</style></url></related-urls><pdf-urls><url>internal-pdf://3172685974/Alizadehsaravi-2020-Modulation of soleus muscl.pdf</url></pdf-urls></urls><custom2><style face="normal" font="default" size="100%">PMC7286858</style></custom2><electronic-resource-num><style face="normal" font="default" size="100%">10.1007/s00221-020-05784-0</style></electronic-resource-num></record><record><database name="stability.enl" path="/Users/sjoerd/Dropbox/Endnote library/stability.enl">stability.enl</database><source-app name="EndNote" version="18.2">EndNote</source-app><rec-number>3249</rec-number><foreign-keys><key app="EN" db-id="05zd2dwf65r5xeetapvvprt3twdpzww9we55">3249</key></foreign-keys><ref-type name="Journal Article">17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Punt, M.</style></author><author><style face="normal" font="default" size="100%">Bruijn, S. M.</style></author><author><style face="normal" font="default" size="100%">van de Port, I. G.</style></author><author><style face="normal" font="default" size="100%">de Rooij, I. J. M.</style></author><author><style face="normal" font="default" size="100%">Wittink, H.</style></author><author><style face="normal" font="default" size="100%">van Dieen, J. H.</style></author></authors></contributors><auth-address><style face="normal" font="default" size="100%">1 Utrecht University of Applied Sciences.
2 Vrije Universiteit Amsterdam.
3 Fujian Medical University.
4 Revant Rehabilitation Center Breda.</style></auth-address><titles><title><style face="normal" font="default" size="100%">Does a Perturbation-Based Gait Intervention Enhance Gait Stability in Fall-Prone Stroke Survivors? A Pilot Study</style></title><secondary-title><style face="normal" font="default" size="100%">J Appl Biomech</style></secondary-title></titles><periodical><full-title><style face="normal" font="default" size="100%">J Appl Biomech</style></full-title></periodical><pages><style face="normal" font="default" size="100%">1-9</style></pages><edition><style face="normal" font="default" size="100%">2019/01/25</style></edition><keywords><keyword><style face="normal" font="default" size="100%">balance</style></keyword><keyword><style face="normal" font="default" size="100%">falls</style></keyword><keyword><style face="normal" font="default" size="100%">gait characteristics</style></keyword><keyword><style face="normal" font="default" size="100%">training</style></keyword></keywords><dates><year><style face="normal" font="default" size="100%">2019</style></year><pub-dates><date><style face="normal" font="default" size="100%">Feb 10</style></date></pub-dates></dates><isbn><style face="normal" font="default" size="100%">1543-2688 (Electronic)
1065-8483 (Linking)</style></isbn><accession-num><style face="normal" font="default" size="100%">30676147</style></accession-num><abstract><style face="normal" font="default" size="100%">A recent review indicated that perturbation-based training (PBT) interventions are effective in reducing falls in older adults and patients with Parkinson's disease. It is unknown whether this type of intervention is effective in stroke survivors. We determined whether PBT can enhance gait stability in stroke survivors. A total of 10 chronic stroke survivors who experienced falls in the past 6 months participated in the PBT. Participants performed 10 training sessions over a 6-week period. The gait training protocol was progressive, and each training contained unexpected gait perturbations and expected gait perturbations. Evaluation of gait stability was performed by determining steady-state gait characteristics and daily-life gait characteristics. We previously developed fall prediction models for both gait assessment methods. We evaluated whether predicted fall risk was reduced after PBT according to both models. Steady-state gait characteristics significantly improved, and consequently, predicted fall risk was reduced after the PBT. However, daily-life gait characteristics did not change, and thus, predicted fall risk based on daily-life gait remained unchanged after the PBT. A PBT resulted in more stable gait on a treadmill and thus lower predicted fall risk. However, the more stable gait on the treadmill did not transfer to a more stable gait in daily life.</style></abstract><notes><style face="normal" font="default" size="100%">Punt, Michiel
Bruijn, Sjoerd M
van de Port, Ingrid G
de Rooij, Ilona J M
Wittink, Harriet
van Dieen, Jaap H
eng
J Appl Biomech. 2019 Feb 10:1-9. doi: 10.1123/jab.2017-0282.</style></notes><urls><related-urls><url><style face="normal" font="default" size="100%">https://www.ncbi.nlm.nih.gov/pubmed/30676147</style></url></related-urls><pdf-urls><url>internal-pdf://0522971726/[email protected]</url></pdf-urls></urls><electronic-resource-num><style face="normal" font="default" size="100%">10.1123/jab.2017-0282</style></electronic-resource-num></record><record><database name="stability.enl" path="/Users/sjoerd/Dropbox/Endnote library/stability.enl">stability.enl</database><source-app name="EndNote" version="18.2">EndNote</source-app><rec-number>3336</rec-number><foreign-keys><key app="EN" db-id="05zd2dwf65r5xeetapvvprt3twdpzww9we55">3336</key></foreign-keys><ref-type name="Journal Article">17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Prins, M. R.</style></author><author><style face="normal" font="default" size="100%">Cornelisse, L. E.</style></author><author><style face="normal" font="default" size="100%">Meijer, O. G.</style></author><author><style face="normal" font="default" size="100%">van der Wurff, P.</style></author><author><style face="normal" font="default" size="100%">Bruijn, S. M.</style></author><author><style face="normal" font="default" size="100%">van Dieen, J. H.</style></author></authors></contributors><auth-address><style face="normal" font="default" size="100%">Research and Development, Military Rehabilitation Centre 'Aardenburg', Doorn, the Netherlands; Department of Human Movement Sciences, Faculty of Behavioural and Movement Sciences, Vrije Universiteit Amsterdam and Amsterdam Movement Sciences, Amsterdam, the Netherlands; Institute for Human Movement Studies, HU University of Applied Sciences Utrecht, Utrecht, the Netherlands. Electronic address: [email protected].
Research and Development, Military Rehabilitation Centre 'Aardenburg', Doorn, the Netherlands; Department of Human Movement Sciences, Faculty of Behavioural and Movement Sciences, Vrije Universiteit Amsterdam and Amsterdam Movement Sciences, Amsterdam, the Netherlands.
Department of Human Movement Sciences, Faculty of Behavioural and Movement Sciences, Vrije Universiteit Amsterdam and Amsterdam Movement Sciences, Amsterdam, the Netherlands; Orthopaedic Biomechanics Laboratory, Fujian Medical University, Quanzhou, Fujian, PR China.
Research and Development, Military Rehabilitation Centre 'Aardenburg', Doorn, the Netherlands; Institute for Human Movement Studies, HU University of Applied Sciences Utrecht, Utrecht, the Netherlands.
Department of Human Movement Sciences, Faculty of Behavioural and Movement Sciences, Vrije Universiteit Amsterdam and Amsterdam Movement Sciences, Amsterdam, the Netherlands; Orthopaedic Biomechanics Laboratory, Fujian Medical University, Quanzhou, Fujian, PR China; Institute of Brain and Behaviour Amsterdam, the Netherlands.
Department of Human Movement Sciences, Faculty of Behavioural and Movement Sciences, Vrije Universiteit Amsterdam and Amsterdam Movement Sciences, Amsterdam, the Netherlands.</style></auth-address><titles><title><style face="normal" font="default" size="100%">Axial pelvis range of motion affects thorax-pelvis timing during gait</style></title><secondary-title><style face="normal" font="default" size="100%">J Biomech</style></secondary-title></titles><periodical><full-title><style face="normal" font="default" size="100%">J Biomech</style></full-title><abbr-1><style face="normal" font="default" size="100%">Journal of biomechanics</style></abbr-1></periodical><pages><style face="normal" font="default" size="100%">109308</style></pages><volume><style face="normal" font="default" size="100%">95</style></volume><edition><style face="normal" font="default" size="100%">2019/08/23</style></edition><keywords><keyword><style face="normal" font="default" size="100%">Coordination</style></keyword><keyword><style face="normal" font="default" size="100%">Gait</style></keyword><keyword><style face="normal" font="default" size="100%">Pelvis</style></keyword><keyword><style face="normal" font="default" size="100%">Range of motion</style></keyword><keyword><style face="normal" font="default" size="100%">Relative phase</style></keyword><keyword><style face="normal" font="default" size="100%">Thorax</style></keyword></keywords><dates><year><style face="normal" font="default" size="100%">2019</style></year><pub-dates><date><style face="normal" font="default" size="100%">Oct 11</style></date></pub-dates></dates><isbn><style face="normal" font="default" size="100%">1873-2380 (Electronic)
0021-9290 (Linking)</style></isbn><accession-num><style face="normal" font="default" size="100%">31431347</style></accession-num><abstract><style face="normal" font="default" size="100%">During gait, patients with pelvic girdle pain and low back pain demonstrate an altered phase relationship between axial thorax and pelvis rotations (thorax-pelvis relative phase). This could be the result of an increase in axial pelvis range of motion (ROM) which has been observed in these patients as well. To establish this relationship, we investigated if altered axial pelvis ROM during gait affects thorax-pelvis relative phase in 12 healthy subjects. These subjects walked on a treadmill and received real-time feedback on axial pelvis rotations. Subjects were asked to (1) walk normal, and walk with (2) decreased and (3) increased pelvis ROM. Gait speed and stride frequency were matched between trials. Subjects were able to increase pelvis ROM to a large extent, but the reduction in pelvis ROM was relatively small. Walking with large pelvis ROM resulted in a change in thorax-pelvis relative phase similar to that in pelvic girdle pain and low back pain. A forward dynamic model was used to predict the effect of manipulation of pelvis ROM on timing of thorax rotations independent of apparent axial trunk stiffness and arm swing amplitude (which can both affect thorax-pelvis relative phase). The model predicted a similar, even larger, effect of large axial pelvis ROM on thorax-pelvis relative phase, as observed experimentally. We conclude that walking with actively increased ROM of axial pelvis rotations in healthy subjects is associated with a shift in thorax-pelvis relative phase, similar to observations in patients with pelvic girdle pain and low back pain.</style></abstract><notes><style face="normal" font="default" size="100%">Prins, Maarten R
Cornelisse, Luca E
Meijer, Onno G
van der Wurff, Peter
Bruijn, Sjoerd M
van Dieen, Jaap H
eng
J Biomech. 2019 Oct 11;95:109308. doi: 10.1016/j.jbiomech.2019.08.002. Epub 2019 Aug 8.</style></notes><urls><related-urls><url><style face="normal" font="default" size="100%">https://www.ncbi.nlm.nih.gov/pubmed/31431347</style></url><url><style face="normal" font="default" size="100%">https://www.sciencedirect.com/science/article/abs/pii/S0021929019305147?via%3Dihub</style></url></related-urls></urls><electronic-resource-num><style face="normal" font="default" size="100%">10.1016/j.jbiomech.2019.08.002</style></electronic-resource-num></record><record><database name="stability.enl" path="/Users/sjoerd/Dropbox/Endnote library/stability.enl">stability.enl</database><source-app name="EndNote" version="18.2">EndNote</source-app><rec-number>3339</rec-number><foreign-keys><key app="EN" db-id="05zd2dwf65r5xeetapvvprt3twdpzww9we55">3339</key></foreign-keys><ref-type name="Journal Article">17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Prins, M. R.</style></author><author><style face="normal" font="default" size="100%">Bruijn, S. M.</style></author><author><style face="normal" font="default" size="100%">Meijer, O. G.</style></author><author><style face="normal" font="default" size="100%">van der Wurff, P.</style></author><author><style face="normal" font="default" size="100%">van Dieen, J. H.</style></author></authors></contributors><auth-address><style face="normal" font="default" size="100%">Research and Development, Military Rehabilitation Centre 'Aardenburg', Doorn, The Netherlands. [email protected].
Department of Human Movement Sciences, Faculty of Behavioural and Movement Sciences, Vrije Universiteit Amsterdam and Amsterdam Movement Sciences, Amsterdam, The Netherlands. [email protected].
Institute for Human Movement Studies, HU University of Applied Sciences Utrecht, Utrecht, The Netherlands. [email protected].
Department of Human Movement Sciences, Faculty of Behavioural and Movement Sciences, Vrije Universiteit Amsterdam and Amsterdam Movement Sciences, Amsterdam, The Netherlands.
Orthopaedic Biomechanics Laboratory, Fujian Medical University, Quanzhou, Fujian, P.R. China.
Research and Development, Military Rehabilitation Centre 'Aardenburg', Doorn, The Netherlands.
Institute for Human Movement Studies, HU University of Applied Sciences Utrecht, Utrecht, The Netherlands.</style></auth-address><titles><title><style face="normal" font="default" size="100%">Axial Thorax-Pelvis Coordination During Gait is not Predictive of Apparent Trunk Stiffness</style></title><secondary-title><style face="normal" font="default" size="100%">Sci Rep</style></secondary-title></titles><periodical><full-title><style face="normal" font="default" size="100%">Sci Rep</style></full-title></periodical><pages><style face="normal" font="default" size="100%">1066</style></pages><volume><style face="normal" font="default" size="100%">9</style></volume><number><style face="normal" font="default" size="100%">1</style></number><edition><style face="normal" font="default" size="100%">2019/02/02</style></edition><dates><year><style face="normal" font="default" size="100%">2019</style></year><pub-dates><date><style face="normal" font="default" size="100%">Jan 31</style></date></pub-dates></dates><isbn><style face="normal" font="default" size="100%">2045-2322 (Electronic)
2045-2322 (Linking)</style></isbn><accession-num><style face="normal" font="default" size="100%">30705368</style></accession-num><abstract><style face="normal" font="default" size="100%">The coordination of axial thorax and pelvis rotations during gait has been shown to be affected by several pathologies. This has been interpreted as an indication of increased apparent axial trunk stiffness, but arm swing may also affect these rotations. The objectives of this study were to assess the effect of trunk stiffness and arm swing on the relative timing ('coordination') between thorax and pelvis rotations, and to assess if apparent trunk stiffness can be inferred from thorax-pelvis kinematics. A forward dynamic model was constructed to estimate apparent trunk stiffness from observed thorax and pelvis rotations and arm swing moment around the longitudinal axis of the trunk of 30 subjects. The effect of independent manipulations of trunk stiffness and arm swing moment on thorax-pelvis coordination and gain of axial thorax-pelvis rotations were assessed using the same forward dynamic model. A linear regression model was constructed to evaluate whether forward dynamic model-based estimates of axial trunk stiffness could be inferred directly from thorax-pelvis rotations. The forward dynamic model revealed that axial trunk stiffness and arm swing moment have opposite effects on axial thorax-pelvis coordination. Apparent axial trunk stiffness could not be predicted from observed thorax-pelvis rotations.</style></abstract><notes><style face="normal" font="default" size="100%">Prins, Maarten R
Bruijn, Sjoerd M
Meijer, Onno G
van der Wurff, Peter
van Dieen, Jaap H
eng
Research Support, Non-U.S. Gov't
England
Sci Rep. 2019 Jan 31;9(1):1066. doi: 10.1038/s41598-018-37549-9.</style></notes><urls><related-urls><url><style face="normal" font="default" size="100%">https://www.ncbi.nlm.nih.gov/pubmed/30705368</style></url><url><style face="normal" font="default" size="100%">https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6355803/pdf/41598_2018_Article_37549.pdf</style></url></related-urls><pdf-urls><url>internal-pdf://0304089168/Prins-2019-Axial Thorax-Pelvis Coordination Du.pdf</url></pdf-urls></urls><custom2><style face="normal" font="default" size="100%">PMC6355803</style></custom2><electronic-resource-num><style face="normal" font="default" size="100%">10.1038/s41598-018-37549-9</style></electronic-resource-num></record><record><database name="stability.enl" path="/Users/sjoerd/Dropbox/Endnote library/stability.enl">stability.enl</database><source-app name="EndNote" version="18.2">EndNote</source-app><rec-number>3335</rec-number><foreign-keys><key app="EN" db-id="05zd2dwf65r5xeetapvvprt3twdpzww9we55">3335</key></foreign-keys><ref-type name="Journal Article">17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Mahaki, M.</style></author><author><style face="normal" font="default" size="100%">Bruijn, S. M.</style></author><author><style face="normal" font="default" size="100%">van Dieen, J. H.</style></author></authors></contributors><auth-address><style face="normal" font="default" size="100%">Faculty of Behavioural and Movement Sciences, VU University Amsterdam, Amsterdam, The Netherlands, Netherlands.
Faculty of Physical Education and Sport Sciences, Kharazmi University Tehran, Tehran, Iran.
Biomechanics Laboratory, Fujian Medical University, Quanzhou, Fujian, China.</style></auth-address><titles><title><style face="normal" font="default" size="100%">The effect of external lateral stabilization on the use of foot placement to control mediolateral stability in walking and running</style></title><secondary-title><style face="normal" font="default" size="100%">PeerJ</style></secondary-title></titles><periodical><full-title><style face="normal" font="default" size="100%">PeerJ</style></full-title></periodical><pages><style face="normal" font="default" size="100%">e7939</style></pages><volume><style face="normal" font="default" size="100%">7</style></volume><edition><style face="normal" font="default" size="100%">2019/11/05</style></edition><keywords><keyword><style face="normal" font="default" size="100%">Balance</style></keyword><keyword><style face="normal" font="default" size="100%">External lateral stabilization</style></keyword><keyword><style face="normal" font="default" size="100%">Foot placement strategy</style></keyword><keyword><style face="normal" font="default" size="100%">Gait stability</style></keyword><keyword><style face="normal" font="default" size="100%">Running</style></keyword><keyword><style face="normal" font="default" size="100%">Stepping strategy</style></keyword><keyword><style face="normal" font="default" size="100%">Walking</style></keyword></keywords><dates><year><style face="normal" font="default" size="100%">2019</style></year></dates><isbn><style face="normal" font="default" size="100%">2167-8359 (Print)
2167-8359 (Linking)</style></isbn><accession-num><style face="normal" font="default" size="100%">31681515</style></accession-num><abstract><style face="normal" font="default" size="100%">It is still unclear how humans control mediolateral (ML) stability in walking and even more so for running. Here, foot placement strategy as a main mechanism to control ML stability was compared between walking and running. Moreover, to verify the role of foot placement as a means to control ML stability in both modes of locomotion, this study investigated the effect of external lateral stabilization on foot placement control. Ten young adults participated in this study. Kinematic data of the trunk (T6) and feet were recorded during walking and running on a treadmill in normal and stabilized conditions. Correlation between ML trunk CoM state and subsequent ML foot placement, step width, and step width variability were assessed. Paired t-tests (either SPM1d or normal) were used to compare aforementioned parameters between normal walking and running. Two-way repeated measures ANOVAs (either SPM1d or normal) were used to test for effects of walking vs. running and of normal vs. stabilized condition. We found a stronger correlation between ML trunk CoM state and ML foot placement and significantly higher step width variability in walking than in running. The correlation between ML trunk CoM state and ML foot placement, step width, and step width variability were significantly decreased by external lateral stabilization in walking and running, and this reduction was stronger in walking than in running. We conclude that ML foot placement is coordinated to ML trunk CoM state to stabilize both walking and running and this coordination is stronger in walking than in running.</style></abstract><notes><style face="normal" font="default" size="100%">Mahaki, Mohammadreza
Bruijn, Sjoerd M
van Dieen, Jaap H
eng
PeerJ. 2019 Oct 28;7:e7939. doi: 10.7717/peerj.7939. eCollection 2019.</style></notes><urls><related-urls><url><style face="normal" font="default" size="100%">https://www.ncbi.nlm.nih.gov/pubmed/31681515</style></url><url><style face="normal" font="default" size="100%">https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6822599/pdf/peerj-07-7939.pdf</style></url></related-urls><pdf-urls><url>internal-pdf://2442186195/Mahaki-2019-The effect of external lateral sta.pdf</url></pdf-urls></urls><custom2><style face="normal" font="default" size="100%">PMC6822599</style></custom2><electronic-resource-num><style face="normal" font="default" size="100%">10.7717/peerj.7939</style></electronic-resource-num></record><record><database name="stability.enl" path="/Users/sjoerd/Dropbox/Endnote library/stability.enl">stability.enl</database><source-app name="EndNote" version="18.2">EndNote</source-app><rec-number>3334</rec-number><foreign-keys><key app="EN" db-id="05zd2dwf65r5xeetapvvprt3twdpzww9we55">3334</key></foreign-keys><ref-type name="Journal Article">17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Kluft, N.</style></author><author><style face="normal" font="default" size="100%">Bruijn, S. M.</style></author><author><style face="normal" font="default" size="100%">Weijer, R. H. A.</style></author><author><style face="normal" font="default" size="100%">van Dieen, J. H.</style></author><author><style face="normal" font="default" size="100%">Pijnappels, M.</style></author></authors></contributors><auth-address><style face="normal" font="default" size="100%">Department of Human Movement Sciences, Vrije Universiteit Amsterdam, Amsterdam Movement Sciences, Amsterdam, The Netherlands.
Institute Brain and Behaviour Amsterdam, Amsterdam, The Netherlands.</style></auth-address><titles><title><style face="normal" font="default" size="100%">Does misjudgement in a stepping down paradigm predict falls in an older population?</style></title><secondary-title><style face="normal" font="default" size="100%">R Soc Open Sci</style></secondary-title></titles><periodical><full-title><style face="normal" font="default" size="100%">R Soc Open Sci</style></full-title></periodical><pages><style face="normal" font="default" size="100%">190786</style></pages><volume><style face="normal" font="default" size="100%">6</style></volume><number><style face="normal" font="default" size="100%">11</style></number><edition><style face="normal" font="default" size="100%">2019/12/13</style></edition><keywords><keyword><style face="normal" font="default" size="100%">age</style></keyword><keyword><style face="normal" font="default" size="100%">balance control</style></keyword><keyword><style face="normal" font="default" size="100%">falls</style></keyword><keyword><style face="normal" font="default" size="100%">locomotion</style></keyword><keyword><style face="normal" font="default" size="100%">strategy selection</style></keyword></keywords><dates><year><style face="normal" font="default" size="100%">2019</style></year><pub-dates><date><style face="normal" font="default" size="100%">Nov</style></date></pub-dates></dates><isbn><style face="normal" font="default" size="100%">2054-5703 (Print)
2054-5703 (Linking)</style></isbn><accession-num><style face="normal" font="default" size="100%">31827831</style></accession-num><abstract><style face="normal" font="default" size="100%">Although measures of actual and perceived physical ability appear to predict falls in older adults, a disparity between these two, also known as misjudgement, may even better explain why some older adults fall, while their peers with similar abilities do not. Therefore, we investigated whether adding a misjudgement term improved prediction of future falls. Besides conventional measures of actual (physical measures) and perceived abilities (questionnaires), we used a stepping down paradigm to quantify behavioural misjudgement. In a sample of 55 older adults (mean age 74.5 (s.d. = 6.6) years, 33 females and 20 fallers over a 10-month follow-up period), we tested the added value of a misjudgement term and of a stepping-down task by comparing experimental Bayesian logistic-regression models to a default null model, which was composed of the conventional measures: Falls Efficacy Scale international and QuickScreen. Our results showed that the default null model fitted the data most accurately; however, the accuracy of all models was low (area under the receiver operating characteristic curve (ROC) </= 0.65). This indicates that neither a misjudgement term based on conventional measures, nor on behavioural measures improved the prediction of future falls in older adults (Bayes Factor10 </= 0.5).</style></abstract><notes><style face="normal" font="default" size="100%">Kluft, N
Bruijn, S M
Weijer, R H A
van Dieen, J H
Pijnappels, M
eng
England
R Soc Open Sci. 2019 Nov 13;6(11):190786. doi: 10.1098/rsos.190786. eCollection 2019 Nov.</style></notes><urls><related-urls><url><style face="normal" font="default" size="100%">https://www.ncbi.nlm.nih.gov/pubmed/31827831</style></url><url><style face="normal" font="default" size="100%">https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6894570/pdf/rsos190786.pdf</style></url></related-urls><pdf-urls><url>internal-pdf://1101513926/Kluft-2019-Does misjudgement in a stepping dow.pdf</url></pdf-urls></urls><custom2><style face="normal" font="default" size="100%">PMC6894570</style></custom2><electronic-resource-num><style face="normal" font="default" size="100%">10.1098/rsos.190786</style></electronic-resource-num></record><record><database name="stability.enl" path="/Users/sjoerd/Dropbox/Endnote library/stability.enl">stability.enl</database><source-app name="EndNote" version="18.2">EndNote</source-app><rec-number>3337</rec-number><foreign-keys><key app="EN" db-id="05zd2dwf65r5xeetapvvprt3twdpzww9we55">3337</key></foreign-keys><ref-type name="Journal Article">17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">de Graaf, M. L.</style></author><author><style face="normal" font="default" size="100%">Hubert, J.</style></author><author><style face="normal" font="default" size="100%">Houdijk, H.</style></author><author><style face="normal" font="default" size="100%">Bruijn, S. M.</style></author></authors></contributors><auth-address><style face="normal" font="default" size="100%">Department of Human Movement Sciences, Vrije Universiteit Amsterdam, Amsterdam Movement Sciences, Amsterdam 1081 BT, The Netherlands.
Department of Research and Development, Heliomare Rehabilitation, Wijk aan Zee, Heliomare 1949 EC, The Netherlands.
Department of Human Movement Sciences, Vrije Universiteit Amsterdam, Amsterdam Movement Sciences, Amsterdam 1081 BT, The Netherlands [email protected].
Institute of Brain and Behavior Amsterdam.
Orthopaedic Biomechanics Laboratory, Fujian Medical University, Quanzhou, 362029, Fujian, China.</style></auth-address><titles><title><style face="normal" font="default" size="100%">Influence of arm swing on cost of transport during walking</style></title><secondary-title><style face="normal" font="default" size="100%">Biol Open</style></secondary-title></titles><periodical><full-title><style face="normal" font="default" size="100%">Biol Open</style></full-title></periodical><volume><style face="normal" font="default" size="100%">8</style></volume><number><style face="normal" font="default" size="100%">6</style></number><edition><style face="normal" font="default" size="100%">2019/05/31</style></edition><keywords><keyword><style face="normal" font="default" size="100%">Arm swing</style></keyword><keyword><style face="normal" font="default" size="100%">Cost of transport</style></keyword><keyword><style face="normal" font="default" size="100%">Energetic cost of walking</style></keyword><keyword><style face="normal" font="default" size="100%">Ground reaction moment</style></keyword><keyword><style face="normal" font="default" size="100%">Locomotion</style></keyword><keyword><style face="normal" font="default" size="100%">Vertical angular momentum</style></keyword></keywords><dates><year><style face="normal" font="default" size="100%">2019</style></year><pub-dates><date><style face="normal" font="default" size="100%">Jun 10</style></date></pub-dates></dates><isbn><style face="normal" font="default" size="100%">2046-6390 (Print)
2046-6390 (Linking)</style></isbn><accession-num><style face="normal" font="default" size="100%">31142466</style></accession-num><abstract><style face="normal" font="default" size="100%">Normal arm swing plays a role in decreasing the cost of transport during walking. However, whether excessive arm swing can reduce the cost of transport even further is unknown. Therefore, we tested the effects of normal and exaggerated arm swing on the cost of transport in the current study. Healthy participants (n=12) walked on a treadmill (1.25 m/s) in seven trials with different arm swing amplitudes (in-phase, passive restricted, active restricted, normal, three gradations of extra arm swing), while metabolic energy cost and the vertical angular momentum (VAM) and ground reaction moment (GRM) were measured. In general, VAM and GRM decreased as arm swing amplitude was increased, except for in the largest arm swing amplitude condition. The decreases in VAM and GRM were accompanied by a decrease in cost of transport from in-phase walking (negative amplitude) up to a slightly increased arm swing (non-significant difference compared to normal arm swing). The most excessive arm swings led to an increase in the cost of transport, most likely due to the cost of swinging the arms. In conclusion, increasing arm swing amplitude leads to a reduction in VAM and GRM, but it does not lead to a reduction in cost of transport for the most excessive arm swing amplitudes. Normal or slightly increased arm swing amplitude appear to be optimal in terms of cost of transport in young and healthy individuals.This article has an associated First Person interview with the first author of the paper.</style></abstract><notes><style face="normal" font="default" size="100%">de Graaf, Myriam L
Hubert, Juul
Houdijk, Han
Bruijn, Sjoerd M
eng
England
Biol Open. 2019 Jun 10;8(6). pii: bio.039263. doi: 10.1242/bio.039263.</style></notes><urls><related-urls><url><style face="normal" font="default" size="100%">https://www.ncbi.nlm.nih.gov/pubmed/31142466</style></url><url><style face="normal" font="default" size="100%">https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6602321/pdf/biolopen-8-039263.pdf</style></url></related-urls><pdf-urls><url>internal-pdf://2426206505/de Graaf-2019-Influence of arm swing on cost o.pdf</url></pdf-urls></urls><custom2><style face="normal" font="default" size="100%">PMC6602321</style></custom2><electronic-resource-num><style face="normal" font="default" size="100%">10.1242/bio.039263</style></electronic-resource-num></record></records></xml>