ABSTRACT

Inconsistent filtering of force plate data persists in published studies. Previous evidence suggests that low pass filtering produces the largest error when calculating jump height, but used jump height from unfiltered force plate data as the criterion. This study investigated the effects of low pass filtering on jump height calculated from force plate data, using jump height recorded from optical motion capture as the criterion. Unfiltered as well as both single and dual pass filtered data, with cutoff frequencies of 100, 50 and 5 Hz, were used to calculate jump height using take-off velocity (TOV) and take-off velocity summed with displacement (TOV+s). The TOV+s method using the 5 Hz single pass filtered signal, best agreed with the criterion (p < .001). This was accomplished through changes in the force-time signal that decreased velocity and increased displacement at take-off (p < .001). This is contrary to previous recommendations and informs the development of standard procedures.

摘要

已发表的研究中仍然存在对测力台数据的不一致过滤。先前的证据表明，低通滤波在计算跳跃高度时会产生最大的误差，但使用来自未过滤测力台数据的跳跃高度作为标准。本研究使用从光学运动捕捉记录的跳跃高度作为标准，研究了低通滤波对从测力台数据计算的跳跃高度的影响。截止频率为 100、50 和 5 Hz 的未滤波以及单通道和双通道滤波数据用于使用起飞速度 (TOV) 和起飞速度与位移相加 (TOV+s) 计算跳跃高度. 使用 5 Hz 单通滤波信号的 TOV+s 方法，最符合标准（p< .001）。这是通过力-时间信号的变化来实现的，该信号在起飞时降低了速度并增加了位移（p < .001）。这与以前的建议相反，并为标准程序的制定提供了信息。