Patterns of center of presure migration during prolonged unconstrained standing.
Patterns of center of presure migration during prolonged unconstrained standing.
复制标题
长时间无约束站立期间压力中心迁移的模式。
作者：
Marcos Duarte;Valdimir M. Zatsiorsky
对10名年轻健康受试者进行了长时间（bbb30 min）无约束站立（PUS）的研究。通常的稳定性分析方法假定压力中心（COP）是随机偏移的。本研究基于相反的想法，并表明在pu期间，COP迁移的特定和一致模式可以通过计算机算法识别。发现了3种COP迁移模式：(a)移动，COP的平均位置从一个区域快速移动到另一个区域；(b)抖动，快速而大的位移，COP返回到大约相同的位置；(c)漂移，COP平均位置的缓慢连续位移。编写了软件代码，并选择了默认参数值来识别COP迁移模式。对于30min的PUS，发现了以下模式：通常在前后（a-p）方向每316 +/- 292秒移动一次，平均移动幅度为17 +/- 15 mm，在中外侧（m-l）方向每199 +/- 148秒移动一次，平均移动幅度为22 +/- 38 mm。相应的坐立不安时间间隔为a-p方向59 +/- 15秒，m-l方向49 +/- 16秒。a-p方向的平均漂间间隔为319 +/- 173秒，m-l方向为529 +/- 333秒。
Prolonged (>30 min) unconstrained standing (PUS) was studied in 10 young healthy subjects. The usual methods of stabilographic analysis assume a random center of pressure (COP) migration. This study was based on the opposite idea and showed that during PUS, specific and consistent patterns of the COP migration can be recognized by a computer algorithm. Three COP migration patterns were found: (a) shifting, a fast displacement of the average position of COP from one region to another; (b) fidgeting, a fast and large displacement and returning of COP to approximately the same position; and (c) drifting, a slow continuous displacement of the average position of COP. A software code was written and default parameter values were chosen for recognizing COP migration patterns. For 30-min PUS the following patterns were identified: Shifting was generally observed every 316 +/- 292 sec in the anterior-posterior (a-p) direction with an average shift amplitude of 17 +/- 15 mm, and every 199 +/- 148 sec in the medial-lateral (m-l) direction with an average shift amplitude of 22 +/- 38 mm. Corresponding time intervals for fidgeting were 59 +/- 15 sec in the a-p direction and 49 +/- 16 sec in the m-l direction. The average drift-to-drift interval was 319 +/- 173 sec in the a-p direction and 529 +/- 333 sec in the m-l direction.