The influence of center-of-mass movements on the variation in the structure of human postural sway
The influence of center-of-mass movements on the variation in the structure of human postural sway
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DOI：
10.1016/j.jbiomech.2012.10.016
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发表时间：
2013-02-01
影响因子：
2.4
通讯作者：
Vereijken, Beatrix
中科院分区：
文献类型：
--
作者：
Ihlen, Espen A. F.;Skjaeret, Nina;Vereijken, Beatrix
本文研究了质心运动对人体姿态摆动中结构变化的影响。12名健康年轻人在两个测力板上进行60 s安静站立、60 s放松站立和10 min放松站立。根据地面反作用力和力矩计算压力中心（Cop）和重力线（GL）轮廓。通过局部标度指数h（t）计算CoP结构的时间变化，并利用MonteCarlo替代检验识别时间尺度之间的相位耦合。与安静站立相比，放松站立时ht的变化范围显著更大（p < 0.00001），并且与GL运动范围高度相关（r > 0.76，p < 0.001）。然而，拟合的变化不是由GL移动产生的，因为CoP-GL迹线接近于ht的相同变化（r > 0.95，p < 0.00001）。Monte Carlo替代检验表明，存在间歇性相位耦合的时间尺度之间的COP轨迹和CoP-GL的残差与GL运动的时期。目前的研究结果表明，人体姿势控制的间歇性相位耦合的CoP和GL运动。此外，CoP结构变化的研究可能会扩展现有的姿势控制变化理论，例如老年人和神经退行性疾病患者。(C)2012爱思唯尔有限公司保留所有权利。
The present article investigates the influence of center-of-mass movements on the variation of the structure in human postural sway. Twelve healthy younger persons performed 60 s quiet standing, 60 s relaxed standing, and 10 min relaxed standing on two force plates. Center-of-pressure (Cop) and gravitational line (GL) profiles were calculated from the ground reaction forces and moments. The temporal variation of CoP structure was calculated by the local scaling exponent h(t) and a Monte Carlo surrogate test was used to identify phase couplings between temporal scales. The range of variation of ht was significantly larger in relaxed standing compared to quiet standing (p < 0.00001) and highly correlated with the range of GL movements (r > 0.76, p < 0.001). However, the variation in fit was not generated by the GL movements because the CoP-GL traces was close to identical variation in ht (r > 0.95, p < 0.00001). The Monte Carlo surrogate test indicated the presence of intermittent phase couplings between the temporal scales of both COP traces and the CoP-GL residuals in the periods with GL movements. The present results suggest that human posture is controlled by intermittent phase coupling of the CoP and GL movements. Furthermore, the investigation of the variation in CoP structure might extend existing theories of changes in postural control for example older persons and patients with a neurodegenerative disease. (C) 2012 Elsevier Ltd. All rights reserved.