Altered active control of step width in response to mediolateral leg perturbations while walking

Abstract During human walking, step width is predicted by mediolateral motion of the pelvis, a relationship that can be attributed to a combination of passive body dynamics and active sensorimotor control. The purpose of the present study was to investigate whether humans modulate the active control...

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Autores principales:	Nicholas K. Reimold, Holly A. Knapp, Rachel E. Henderson, Landi Wilson, Alyssa N. Chesnutt, Jesse C. Dean
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2020
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/b886018c39694256921a853e0ed2155c
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spelling	oai:doaj.org-article:b886018c39694256921a853e0ed2155c2021-12-02T16:26:36ZAltered active control of step width in response to mediolateral leg perturbations while walking10.1038/s41598-020-69052-52045-2322https://doaj.org/article/b886018c39694256921a853e0ed2155c2020-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-020-69052-5https://doaj.org/toc/2045-2322Abstract During human walking, step width is predicted by mediolateral motion of the pelvis, a relationship that can be attributed to a combination of passive body dynamics and active sensorimotor control. The purpose of the present study was to investigate whether humans modulate the active control of step width in response to a novel mechanical environment. Participants were repeatedly exposed to a force-field that either assisted or perturbed the normal relationship between pelvis motion and step width, separated by washout periods to detect the presence of potential after-effects. As intended, force-field assistance directly strengthened the relationship between pelvis displacement and step width. This relationship remained strengthened with repeated exposure to assistance, and returned to baseline afterward, providing minimal evidence for assistance-driven changes in active control. In contrast, force-field perturbations directly weakened the relationship between pelvis motion and step width. Repeated exposure to perturbations diminished this negative direct effect, and produced larger positive after-effects once the perturbations ceased. These results demonstrate that targeted perturbations can cause humans to adjust the active control that contributes to fluctuations in step width.Nicholas K. ReimoldHolly A. KnappRachel E. HendersonLandi WilsonAlyssa N. ChesnuttJesse C. DeanNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 10, Iss 1, Pp 1-15 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Nicholas K. Reimold Holly A. Knapp Rachel E. Henderson Landi Wilson Alyssa N. Chesnutt Jesse C. Dean Altered active control of step width in response to mediolateral leg perturbations while walking
description	Abstract During human walking, step width is predicted by mediolateral motion of the pelvis, a relationship that can be attributed to a combination of passive body dynamics and active sensorimotor control. The purpose of the present study was to investigate whether humans modulate the active control of step width in response to a novel mechanical environment. Participants were repeatedly exposed to a force-field that either assisted or perturbed the normal relationship between pelvis motion and step width, separated by washout periods to detect the presence of potential after-effects. As intended, force-field assistance directly strengthened the relationship between pelvis displacement and step width. This relationship remained strengthened with repeated exposure to assistance, and returned to baseline afterward, providing minimal evidence for assistance-driven changes in active control. In contrast, force-field perturbations directly weakened the relationship between pelvis motion and step width. Repeated exposure to perturbations diminished this negative direct effect, and produced larger positive after-effects once the perturbations ceased. These results demonstrate that targeted perturbations can cause humans to adjust the active control that contributes to fluctuations in step width.
format	article
author	Nicholas K. Reimold Holly A. Knapp Rachel E. Henderson Landi Wilson Alyssa N. Chesnutt Jesse C. Dean
author_facet	Nicholas K. Reimold Holly A. Knapp Rachel E. Henderson Landi Wilson Alyssa N. Chesnutt Jesse C. Dean
author_sort	Nicholas K. Reimold
title	Altered active control of step width in response to mediolateral leg perturbations while walking
title_short	Altered active control of step width in response to mediolateral leg perturbations while walking
title_full	Altered active control of step width in response to mediolateral leg perturbations while walking
title_fullStr	Altered active control of step width in response to mediolateral leg perturbations while walking
title_full_unstemmed	Altered active control of step width in response to mediolateral leg perturbations while walking
title_sort	altered active control of step width in response to mediolateral leg perturbations while walking
publisher	Nature Portfolio
publishDate	2020
url	https://doaj.org/article/b886018c39694256921a853e0ed2155c
work_keys_str_mv	AT nicholaskreimold alteredactivecontrolofstepwidthinresponsetomediolaterallegperturbationswhilewalking AT hollyaknapp alteredactivecontrolofstepwidthinresponsetomediolaterallegperturbationswhilewalking AT rachelehenderson alteredactivecontrolofstepwidthinresponsetomediolaterallegperturbationswhilewalking AT landiwilson alteredactivecontrolofstepwidthinresponsetomediolaterallegperturbationswhilewalking AT alyssanchesnutt alteredactivecontrolofstepwidthinresponsetomediolaterallegperturbationswhilewalking AT jessecdean alteredactivecontrolofstepwidthinresponsetomediolaterallegperturbationswhilewalking
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Altered active control of step width in response to mediolateral leg perturbations while walking

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