Instrumented assessments of quiet-stance postural control typically involve recording and analyzing of body sway signal, most often the center of pressure (CoP) movement. It has been recently suggested that transient characteristics of body sway may offer additional information regarding postural control. In this study, we explored the relationship between whole-trial estimates of body sway (CoP velocity, amplitude, and frequency) and corresponding transient behavior indexes, as well as the effects of leg preference. A total of 705 healthy young athletes performed 30 s single-leg body sway trials for both legs. It was found that the transient characteristics of the body sway (expressed as relative differences between individual time intervals within the trial) are in negligible or weak correlation (r ≤ 0.26) with the corresponding variables, averaged across the whole trial. All CoP variables showed transient characteristics, reflected in statistically significant decrease (CoP velocity and amplitude) or increase (CoP frequency) throughout the trial. The preferred leg showed smaller body sway; however, the effect sizes were very small. Moreover, differences between the legs were also noted in terms of transient characteristics of body sway. In particular, the preferred leg showed earlier reduction in anterior–posterior body sway and larger reduction in medial–lateral body sway. Further studies should focus on examining the clinical utility of indexes of transient behavior of body sway, for instance, their sensitivity to aging-related changes and risk of falling.

安静姿势姿势控制的仪器化评估通常包括记录和分析身体摇摆信号，最常见的是压力中心（CoP）运动。最近已经提出，身体摇摆的瞬时特性可以提供有关姿势控制的附加信息。在这项研究中，我们探索了人体摇摆的整个试验估计值（CoP速度，幅度和频率）与相应的瞬态行为指标之间的关系，以及腿部偏爱的影响。总共705名健康的年轻运动员对双腿进行了30秒的单腿身体摇摆试验。发现人体摇摆的瞬态特征（表示为试验中各个时间间隔之间的相对差异）的相关性可忽略不计或微弱（[R≤0.26），并在整个试验中平均得出相应的变量。在整个试验期间，所有CoP变量均显示出瞬时特征，反映为统计学上显着的下降（CoP速度和幅度）或上升（CoP频率）。首选的腿显示较小的身体摇摆；但是，效果大小很小。此外，在身体摇摆的瞬时特征方面也注意到了腿之间的差异。特别是，优选的腿部显示出较早的前后摆动，而较大的减少了内侧-外侧摆动。进一步的研究应侧重于检查人体摇摆的瞬态行为指标的临床实用性，例如，它们对衰老相关变化的敏感性和跌倒的风险。