Postural Stability Margins as a Function of Support Surface Slopes.
Postural Stability Margins as a Function of Support Surface Slopes.
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DOI：
10.1371/journal.pone.0164913
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发表时间：
2016
期刊：
影响因子：
3.7
通讯作者：
Newell KM
中科院分区：
文献类型：
--
作者：
Dutt-Mazumder A;Slobounov SM;Challis JH;Newell KM
本研究探讨了青少年安静站立时支撑面倾斜度(35°、30°、20°、10°(趾)向下，0°平坦(趾)、10°、20°、25°(趾)向上)和姿势方向对姿势稳定性边缘的影响。结果表明，在基线(0°平坦)平台状态下，压力中心COP(位移、面积和长度)的运动最小，并随着平台角度的增加而逐渐增大。虚拟碰撞时间(VTC)动力学显示，随着坡度的增加，VTC时间序列到功能稳定性边界的时空裕度逐渐变小，VTC时间序列也更加规则(SampEn-Sample Entropy)。地表坡面产生一个低维VTC动力学的受限稳定区域，当姿态朝向下坡时，该区域受到更多的约束。这些发现进一步证明，VTC作为站立姿势的控制变量，受到个体-环境-任务交互作用的涌现动态的影响。
This investigation examined the effects of slope of the surface of support (35°, 30°, 20°, 10° Facing(Toe) Down, 0° Flat and 10°, 20°, 25° Facing (Toe) Up) and postural orientation on the margins of postural stability in quiet standing of young adults. The findings showed that the center of pressure—CoP (displacement, area and length) had least motion at the baseline (0° Flat) platform condition that progressively increased as a function of platform angle in both facing up and down directions. The virtual time to collision (VTC) dynamics revealed that the spatio-temporal margins to the functional stability boundary were progressively smaller and the VTC time series also more regular (SampEn–Sample Entropy) as slope angle increased. Surface slope induces a restricted stability region with lower dimension VTC dynamics that is more constrained when postural orientation is facing down the slope. These findings provide further evidence that VTC acts as a control variable in standing posture that is influenced by the emergent dynamics of the individual-environment-task interaction.
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