Rambling and trembling in quiet standing
Rambling and trembling in quiet standing
复制标题
DOI：
10.1123/mcj.4.2.185
复制
发表时间：
2000-04-01
期刊：
影响因子：
1.1
通讯作者：
Duarte, M
中科院分区：
文献类型：
--
作者：
Zatsiorsky, VM;Duarte, M
这项研究的目的是探索安静站立时散漫-颤抖的分解。健康受试者在测力平台上以直立双足姿势记录压力中心(COP)和水平地面反作用力(F-HOR)。利用随机抖动分解和重力线分解两种不同的方法将COP时间序列划分为两个分量：F-HOR=0时的瞬时平衡点(IEP)。这两种分解技术提供了非常相似的结果。抖动轨迹与COP和重力线的差之间存在着出乎意料的大相关性，r=0.91(范围0.83；r<；0.98)。这种相关性意味着GL从一个IEP移动到下一个IEP，沿着可以由样条线近似预测的平滑轨迹移动。在零时滞下观察到震颤与F-hor-0.90<；r<；-0.75之间存在显著的负相关。对于漫步轨迹，与F-HOR的相关系数较低，为-0.33；r<；-0.05。数据支持这一假设，即在安静的站立状态下，身体摇摆有两个原因：参考点的移动(漫无边际)和偏离参考点的偏离(颤抖)。
The goal of this study was to explore the rambling-trembling decomposition in quiet standing. The center of pressure (COP) and the horizontal ground reaction force (F-hor) were registered in healthy subjects standing in an upright bipedal posture on a force platform. The COP positions at the instants when F-hor = 0 were identified (instant equilibrium points, IEP) for the anterior-posterior direction, then the COP time series, were partitioned into its components using 2 different techniques, rambling-trembling decomposition and gravity line decomposition. The two decomposition techniques provided very similar results. An unexpectedly large correlation between the trembling trajectory and the difference between COP and gravity line was found, r = 0.91 (range, 0.83 < r < 0.98). The correlation implies that the GL moves from an IEP to the subsequent IEP along a smooth trajectory that can be predicted by the spline approximation. A substantial negative cross-correlation at a zero time lag was observed between the trembling and the F-hor -0.90 < r < -0.75. For the rambling trajectory, the coefficients of correlation with F-hor were low, -0.33 < r < -0.05. The data support the hypothesis that during quiet standing the body sways for two reasons: the migration of the reference point (rambling) and the deviation away from that point (trembling).