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首页> 外文期刊>Journal of Neurophysiology >A new interpretation of spontaneous sway measures based on a simple model of human postural control.
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A new interpretation of spontaneous sway measures based on a simple model of human postural control.

机译：基于人体姿势控制的简单模型的自发摇摆措施的新解释。

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摘要

This study shows that center-of-pressure (COP) traces that closely resemble physiologically measured COP functions can be produced by an appropriate selection of model parameters in a simple feedback model of the human postural control system. Variations in the values of stiffness, damping, time delay, and noise level determine the values of 15 sway measures commonly used to characterize spontaneous sway. Results from model simulations indicate that there is a high degree of correlation among these sway measures, and the measures cluster into three different groups. Only two principal components accounted for about 92% of the variation among the different sway measures analyzed. This model can be used to formulate hypotheses regarding the cause of postural control deficits reported in the literature. This is accomplished using a multidimensional optimization procedure to estimate model parameters from a diverse set of spontaneous sway measures. These model parameters describe physiologically meaningfulfeatures of the postural control system as opposed to conventional sway measures that provide only a parametric description of sway. To show the application of this method, we applied it to published data of spontaneous sway from elderly subjects and contrasted it to the data of young healthy subjects. We found that modest increases in stiffness and damping and a fairly large increase in noise level with aging could account for the variety of sway measures reported in the literature for elderly subjects.
机译：这项研究表明，通过在人体姿势控制系统的简单反馈模型中适当选择模型参数，可以生成与生理测量的COP功能极为相似的压力中心（COP）轨迹。刚度，阻尼，时间延迟和噪音水平的值的变化确定了通常用于表征自发摇摆的15种摇摆测量的值。模型仿真的结果表明，这些摇摆测度之间存在高度相关性，并且测度可分为三个不同的组。在所分析的不同摇摆措施之间，只有两个主要成分构成了大约92％的变化。该模型可用于阐述有关文献中报告的姿势控制缺陷原因的假设。这是通过使用多维优化程序从各种自发摇摆测量值估计模型参数来完成的。这些模型参数描述了姿势控制系统的生理学有意义的特征，这与常规的摇摆测量方法（仅提供摇摆的参数描述）相反。为了显示该方法的应用，我们将其应用于已发表的老年受试者自发摇摆数据，并将其与年轻健康受试者的数据进行对比。我们发现，随着年龄的增长，刚度和阻尼的适度增加以及噪声水平的相当大的增加可以解释文献中针对老年受试者的各种摇摆措施。

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