REPEATABILITY OF PHASIC MUSCLE-ACTIVITY - PERFORMANCE OF SURFACE AND INTRAMUSCULAR WIRE ELECTRODES IN GAIT ANALYSIS
REPEATABILITY OF PHASIC MUSCLE-ACTIVITY - PERFORMANCE OF SURFACE AND INTRAMUSCULAR WIRE ELECTRODES IN GAIT ANALYSIS
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DOI：
10.1002/jor.1100030312
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发表时间：
1985-01-01
影响因子：
2.8
通讯作者：
COCHRAN, GVB
中科院分区：
文献类型：
--
作者：
KADABA, MP;WOOTTEN, ME;COCHRAN, GVB
可重复性是步态分析数据的一个重要考虑因素，这些数据被用作临床决策的辅助工具。重复性指数可以基于反映在多个相同周期上的波形的相似性的统计标准(方差比)。本研究的目的是使用变异率来评估10名正常人在步态过程中用表面电极和双极肌内电极记录的时相肌肉活动的重复性。使用从两种电极同时记录的校正和平滑的肌电数据来计算方差比。重复性的三个指标(重复性、可靠性和稳定性--定义为肌肉活动时相的周期间、跑间和日间可重复性)被用来比较两种电极技术的性能。结果表明，表面电极的重复性和可靠性好于肌内电极，稳定性好于表面电极，肌内电极较差。重复性随着平滑窗口长度的增加而提高，但无论平滑窗口如何，表面电极的重复性都好于线电极。这项研究表明，如果要比较不同测试日期的步态数据，表面电极数据代表了浅层肌肉活动的更一致的衡量标准。
Repeatability is an important consideration for gait analysis data that are being used as an adjunct to clinical decision making. An index of repeatability may be based on a statistical criterion (variance ratio) that reflects similarity of wave forms over a number of identical cycles. The purpose of this study was to use the variance ratio to assess the repeatability of phasic muscle activity recorded with surface and bipolar intramuscular wire electrodes during gait on 10 normal subjects. Variance ratios were calculated using rectified and smoothed electromyographic data recorded simultaneously from the two types of electrodes. Three measures of repeatability (reproducibility, reliability, and constancy-defined as the cycle-to-cycle, run-to-run, and day-to-day repeatability of phasic muscle activity) were used to compare the performance of the two electrode techniques. Results show that the reproducibility and reliability were better for surface electrodes than for intramuscular wire electrodes, and constancy was good for surface electrodes and poor for intramuscular wire electrodes. Repeatability improved with increasing smoothing window lengths but was better for surface electrodes than wire electrodes, irrespective of the smoothing window. This study indicates that surface electrode data represent a more consistent measure of activity of superficial muscles if comparisons are to be made between gait data from different tests days.