Predicting the dynamic postural control response from quiet-stance behavior in elderly adults
Predicting the dynamic postural control response from quiet-stance behavior in elderly adults
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DOI：
10.1016/s0021-9290(03)00153-2
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发表时间：
2003-09-01
影响因子：
2.4
通讯作者：
Collins, JJ
中科院分区：
文献类型：
--
作者：
Hsiao-Wecksler, ET;Katdare, K;Collins, JJ
通过安静站立的人脚下压力中心 (COP) 的波动来测量人体姿势摇摆，可以将其描述为随机过程。波动耗散定理 (FDT) 提供了准静态随机系统的波动与扰动后同一系统松弛至平衡之间的线性关系。我们将基于 FDT 的类似线性关系应用于人体姿势控制系统，以探索安静站立期间 COP 的前后（AP）波动是否可用于预测姿势控制系统对弱向后定向机械扰动（腰部的拉动或拉动）的 AP 响应。我们测试了 10 名健康老年人（平均年龄 69 岁）和 10 名健康年轻人（平均年龄 25 岁）成年受试者。我们发现这种线性关系适用于所有 10 名年轻人和 10 名老年人中的 8 名的姿势控制系统。这些结果表明，无论年龄如何，都可以使用安静姿势数据来预测个体对轻微扰动的动态反应。这种基于 FDT 的线性关系与人类姿势控制系统的存在表明，对于给定的个体，姿势控制系统可以在安静姿势和轻微扰动条件下使用相同的控制机制，无论年龄如何。 (C) 2003 Elsevier Science Ltd. 保留所有权利。
Human postural sway, as measured by fluctuations of the center of pressure (COP) under the feet of a quietly standing individual, can be characterized as a stochastic process. The fluctuation-dissipation theorem (FDT) provides a linear relationship between the fluctuations of a quasi-static, stochastic system to the same system's relaxation to equilibrium following a perturbation. We applied a similar linear relationship, based on the FDT, to the human postural control system to explore whether anterior-posterior (AP) fluctuations of the COP during quiet stance can be used to predict the AP response of the postural control system to a weak posteriorly directed mechanical perturbation (tug or pull at the waist). We tested 10 healthy elderly (mean age of 69 yr) and 10 healthy young (mean age of 25 yr) adult subjects. We found that this linear relationship was applicable to the postural control system of all 10 young and eight of the 10 elderly adult subjects. These results suggest that it is possible to predict an individual's dynamic response to a mild perturbation using quiet-stance data, regardless of age. The existence of this FDT-based linear relationship with respect to the human postural control system suggests that, for a given individual, the postural control system may use the same control mechanisms during quiet stance and mild-perturbation conditions, regardless of age. (C) 2003 Elsevier Science Ltd. All rights reserved.