Carpenter M G, Frank J S, Winter D A, Peysar G W
Department of Kinesiology, University of Waterloo, Waterloo, Canada N2L 3G1.
Gait Posture. 2001 Feb;13(1):35-40. doi: 10.1016/s0966-6362(00)00093-x.
The purpose of the present study was to examine the effect of sample duration on the magnitude and reliability of centre of pressure (COP) summary measures commonly used to characterize the control of upright stance. COP was recorded from 49 participants who stood quietly during three consecutive 120 s trials. Each record was subdivided into 15, 30, 60 and 120 s samples and root mean square (RMS), mean power frequency (MPF) and mean position of COP were calculated for each sample. RMS significantly increased and MPF values significantly decreased as sample duration increased. Substantial increases in the reliability of both RMS and MPF were observed with increased sample duration.
本研究的目的是检验采样时长对常用于表征直立姿势控制的压力中心（COP）汇总测量值的大小和可靠性的影响。从49名参与者身上记录了COP，这些参与者在连续三次120秒的试验中安静站立。每次记录被细分为15秒、30秒、60秒和120秒的样本，并计算每个样本的均方根（RMS）、平均功率频率（MPF）和COP的平均位置。随着采样时长的增加，RMS显著增加，MPF值显著降低。随着采样时长的增加，RMS和MPF的可靠性都有显著提高。
