Research Institute MOVE, Institute for Fundamental and Clinical Human Movement Sciences, Faculty of Human Movement Sciences, Vrije Universiteit Amsterdam, Van der Boechorststraat 9, NL-1081 BT Amsterdam, The Netherlands.
Gait Posture. 2010 Jan;31(1):42-6. doi: 10.1016/j.gaitpost.2009.08.242. Epub 2009 Sep 23.
This study investigated a representative set of 39 parameters characterizing center of pressure movements (sway) in seated balancing, with the aims to determine test-retest reliability, to clarify the interrelations between these parameters, and to determine which parameters were related to balance loss in seated balancing. 331 subjects volunteered to perform three 30-s seated balancing trials in a single session. Ten subjects lost balance on all three trials, 34 lost balance on one or two trials. The test-retest reliability of postural sway parameters was poor with all intra-class correlations below 0.7 and below 0.4 for 9 parameters. Sway parameters were strongly intercorrelated and many parameters thus provide little added value. Parameters that had no intercorrelations above 0.7 comprised three conventional summary statistics of center of pressure (CoP) movements and 3 parameters reflecting the temporal structure of the CoP trajectories. None of the parameters was related with balance loss in univariate analyses, while multivariate models revealed that higher sway velocity and a lower short-term diffusion coefficient were related with less balance loss. This indicates that a multivariate assessment of CoP trajectories is necessary to characterize balancing performance.
本研究调查了一组具有代表性的 39 个参数，这些参数描述了坐姿平衡时的压力中心运动（摇晃），目的是确定测试-重测可靠性，阐明这些参数之间的相互关系，并确定哪些参数与坐姿平衡时的平衡丧失有关。331 名受试者自愿在一次会议中进行三次 30 秒的坐姿平衡试验。10 名受试者在所有三次试验中均失去平衡，34 名受试者在一次或两次试验中失去平衡。姿势摇晃参数的测试-重测可靠性较差，所有组内相关系数均低于 0.7，9 个参数的组内相关系数均低于 0.4。摇晃参数之间高度相关，许多参数因此提供的附加值很小。没有相关性高于 0.7 的参数包括三个压力中心（CoP）运动的常规综合统计量和 3 个反映 CoP 轨迹时间结构的参数。在单变量分析中，没有一个参数与平衡丧失有关，而多变量模型表明，较高的摇晃速度和较低的短期扩散系数与较少的平衡丧失有关。这表明需要对 CoP 轨迹进行多变量评估才能描述平衡性能。
