Department of Kinesiology, The Pennsylvania State University, University Park, PA 16802, USA.
Psychol Aging. 2009 Dec;24(4):809-18. doi: 10.1037/a0017911.
It is well established that there is an increased amount of intraindividual variability with aging in a variety of behavioral contexts. Here, we elaborate from a self-organization and dynamic systems framework to investigate the relevant time scales of variability as a function of aging and their relation to the changes in the amount and structure (frequency and time domains) of movement and postural variability. In particular, we examine evidence for the general hypotheses that (a) there is a reduction or even loss of shorter time scales in the control of movement with aging and (b) the shorter the time scale in motor output variability, the more sensitive the measure is as a biomarker to revealing the onset and early influence of aging and disease. The dynamic analysis of the time scales of variability distinguishes the distinctive roles of stability and noise in the increased amount of intraindividual variability with aging.
众所周知，在各种行为背景下，个体内部的变异性随着年龄的增长而增加。在这里，我们从自组织和动力系统框架出发，详细研究了变异性的相关时间尺度作为衰老的函数，以及它们与运动和姿势变异性的数量和结构（频率和时域）变化的关系。具体来说，我们检验了以下一般假设的证据：（a）随着年龄的增长，运动控制的较短时间尺度减少甚至丧失；（b）运动输出变异性的时间尺度越短，作为生物标志物，该测量对揭示衰老和疾病的发生和早期影响就越敏感。变异性时间尺度的动态分析区分了稳定性和噪声在个体内部变异性随年龄增长而增加中的独特作用。
