The effect of anteroposterior perturbations on the control of the center of mass during treadmill walking

JOURNAL OF BIOMECHANICS

卷:103

Article

van den Bogaart, Maud^1,2  Bruijn, Sjoerd M.^2,3  van Dieen, Jaap H.²  Meyns, Pieter¹ 

[1] Hasselt Univ, Fac Rehabil Sci, Rehabil Res Ctr REVAL, B-3590 Diepenbeek, Belgium

[2] Vrije Univ Amsterdam, Fac Behav & Movement Sci, MOVE Res Inst Amsterdam, Dept Human Movement Sci, NL-1081 BT Amsterdam, Netherlands

[3] Inst Brain & Behav Amsterdam, Amsterdam, Netherlands

关键词: Gait stability;    Perturbed treadmill walking;    Center of mass acceleration;    Foot placement;    Ankle moments;    Counter-rotation mechanism;   

DOI  :  10.1016/j.jbiomech.2020.109660

来源: Elsevier

【 摘 要 】

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. (C) 2020 The Authors. Published by Elsevier Ltd.

【 授权许可】

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