Altered active control of step width in response to mediolateral leg perturbations while walking
Autor: | Rachel E. Henderson, Holly A. Knapp, Jesse C. Dean, Landi Wilson, Alyssa N. Chesnutt, Nicholas K. Reimold |
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Rok vydání: | 2020 |
Předmět: |
Male
0301 basic medicine medicine.medical_specialty Science Walking Article Pelvis Young Adult 03 medical and health sciences Physical medicine and rehabilitation 0302 clinical medicine Motor control Humans Medicine Body dynamics Gait Physics Leg Multidisciplinary business.industry Walking balance Active control Biomechanical Phenomena Sensorimotor control 030104 developmental biology Exercise Test Female business Biomedical engineering 030217 neurology & neurosurgery |
Zdroj: | Scientific Reports, Vol 10, Iss 1, Pp 1-15 (2020) Scientific Reports |
ISSN: | 2045-2322 |
DOI: | 10.1038/s41598-020-69052-5 |
Popis: | 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. Both of these results provide evidence of gradual changes in active control in response to perturbations. In the longer term, these methods may be useful for improving deficits in the active control of step width often observed among clinical populations with poor walking balance. |
Databáze: | OpenAIRE |
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