Wall J C, Scarbrough J
Department of Physical Therapy, University of South Alabama, Mobile 36604, USA.
J Orthop Sports Phys Ther. 1997 Apr;25(4):277-81. doi: 10.2519/jospt.1997.25.4.277.
Before a measurement technique is used clinically, it must be shown to be both valid and reliable. The purpose of this paper was to investigate a novel technique for measuring the temporal phases of the gait cycle using a stopwatch and slow motion video. Two healthy, young adult subjects walked at a range of self-selected walking speeds on a resistive grid walkway. The subjects were videotaped while traversing the walkway. Using video played back at slow motion and a multimemory stopwatch, two student physical therapists independently analyzed the videotapes on five separate occasions. Regression analysis was used to compare the data obtained by each of the raters with those obtained from the walkway. Measurements by both raters correlated highly with those obtained from the walkway. The results indicated a slight bias between the walkway data and the stopwatch technique, but the confidence intervals suggest that the relative timing of key events differed by less than 1%. This study shows that it is possible to get valid and reliable measures of the relative durations of the temporal gait parameters using slow motion video and a multimemory stopwatch.
在一种测量技术用于临床之前，必须证明其既有效又可靠。本文的目的是研究一种使用秒表和慢动作视频来测量步态周期时间阶段的新技术。两名健康的年轻成年受试者在电阻式网格走道上以一系列自我选择的步行速度行走。受试者在穿过走道时被录像。使用慢动作回放的视频和多记忆秒表，两名学生物理治疗师在五个不同场合独立分析录像带。回归分析用于比较每个评分者获得的数据与从走道获得的数据。两位评分者的测量结果与从走道获得的结果高度相关。结果表明走道数据和秒表技术之间存在轻微偏差，但置信区间表明关键事件的相对时间差异小于1%。这项研究表明，使用慢动作视频和多记忆秒表可以获得关于步态时间参数相对持续时间的有效且可靠的测量结果。
