Multiple timescales in postural dynamics associated with vision and a secondary task are revealed by wavelet analysis
Multiple timescales in postural dynamics associated with vision and a secondary task are revealed by wavelet analysis
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DOI：
10.1007/s00221-009-1915-1
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发表时间：
2009-08-01
影响因子：
2
通讯作者：
Silver, Tobin A.
中科院分区：
文献类型：
--
作者：
Chagdes, James R.;Rietdyk, Shirley;Silver, Tobin A.
离散小波分析是用来解决中心的压力时间序列数据到几个时间尺度的组件，提供了新的见解姿势控制。健康的年轻人和老年人安静地站着，睁着或闭着眼睛，要么执行次要任务，要么安静地站着。在没有视觉的情况下，年轻和年长的参与者在长时间尺度内都减少了能量，这支持了视觉用于控制低频姿势摇摆的概念。此外，能量在对应于闭环（体感和前庭）和开环机制的时间尺度上增加，这与从视觉控制转向其他控制机制的想法一致。然而，老年人的增加幅度相对较大。对于次要任务，类似的模式被忽略了-在短时间和中等时间尺度上增加能量，在长时间尺度上减少能量。一个共同的战略的可能性，在时间尺度上的水平，在应对姿势扰动被认为是。
Discrete wavelet analysis is used to resolve the center of pressure time series data into several timescale components, providing new insights into postural control. Healthy young and elderly participants stood quietly with their eyes open or closed and either performed a secondary task or stood quietly. Without vision, both younger and older participants had reduced energy in the long timescales, supporting the concept that vision is used to control low frequency postural sway. Furthermore, energy was increased at timescales corresponding to closed-loop (somatosensory and vestibular) and open-loop mechanisms, consistent with the idea of a shift from visual control to other control mechanisms. However, a relatively greater increase was observed for older adults. With a secondary task a similar pattern was observed-increased energy at the short and moderate timescales, decreased energy at long timescales. The possibility of a common strategy-at the timescale level-in response to postural perturbations is considered.