Reactive responses of the arms increase the Margins of Stability and decrease center of mass dynamics during a slip perturbation
Affiliation
Department of Physical Therapy, University of ArizonaIssue Date
2023-07-22
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Elsevier LtdCitation
Lee-Confer, J. S., Finley, J. M., Kulig, K., & Powers, C. M. (2023). Reactive responses of the arms increase the Margins of Stability and decrease center of mass dynamics during a slip perturbation. Journal of Biomechanics, 157, 111737.Journal
Journal of biomechanicsRights
© 2023 Elsevier Ltd. All rights reserved.Collection Information
This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.Abstract
Although reactive arm motions are important in recovering from a slip event, the biomechanical influences of upper extremity motions during slipping are not clear. The purpose of the current study was to determine whether reactive arm motions during slip recovery leads to increased margins of stability (MoS), and decreased center of mass (CoM) velocity and excursion. Thirty-two participants were randomized into 2 conditions: arms free and arms constrained. Participants traversed a 10-meter walkway and were exposed to an unexpected slip while wearing a protective harness. Anterior-posterior and medial–lateral MoS, as well as the CoM excursion and velocity during the slip perturbation was quantified using a three-dimensional motion capture system. In the frontal plane, individuals with their arms unconstrained demonstrated greater MoS (0.06 ± 0.03 vs −0.01 ± 0.02 m, p < 0.01), decreased CoM excursion (0.05 ± 0.02 vs 0.08 ± 0.01 m, p = 0.015), and a reduced CoM velocity (0.07 ± 0.03 vs. 0.14 ± 0.02 m/s, p < 0.01) compared to individuals with their arms constrained. In the sagittal plane, individuals with their arms unconstrained demonstrated, decreased CoM excursion (0.83 ± 0.13 vs 1.14 ± 0.20 m, p < 0.01) reduced CoM velocity (1.71 ± 0.08 vs. 1.79 ± 0.07 m/s, p = 0.02), but no differences in margins of stability (0.89 ± 0.13 vs 0.94 ± 0.10 m, p = 0.32). Our findings demonstrate that arm motions during a slip perturbation act to restore balance by minimizing displacement and velocity of the body CoM during a slip event in the frontal plane.Note
12 month embargo; first published 22 July 2023EISSN
1873-2380PubMed ID
37499431Version
Final accepted manuscriptae974a485f413a2113503eed53cd6c53
10.1016/j.jbiomech.2023.111737
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Except where otherwise noted, this item's license is described as © 2023 Elsevier Ltd. All rights reserved.
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