Department of Physical Therapy/Program in Exercise Science, Marquette University, Milwaukee, Wisconsin, USA.
J Strength Cond Res. 2010 Apr;24(4):1131-7. doi: 10.1519/JSC.0b013e3181cc2353.
The reliability of electromyographic (EMG) data has been examined for isometric and slow dynamic tasks, but little is known about the repeatability of this data for ballistic movements. The purpose of this study was to examine the within-session, trial-to-trial reliability of a variety of quadriceps and hamstrings muscles during isometric and ballistic activities. Data were analyzed by way of intraclass correlation coefficients (ICC), intersubject coefficients of variation (CVinter), and intrasubject coefficients of variation (CVintra). Twenty-four subjects performed 3 repetitions each of 2 randomly ordered test exercises, including landing from a depth jump (J) and cutting after a 10-m sprint (C). Data were acquired and processed with root mean square EMG for the muscles assessed, and data were analyzed for each exercise using a repeated measures analysis of variance. Results revealed that all ICC values were greater than 0.80, with most values greater than 0.90, CVinter values ranged from 5.4% to 148.7%, and CVintra values ranged from 11.5% to 49.3%. This study indicates that EMG is a reliable method for assessing the reproducibility of both the quadriceps and hamstrings muscle activation during either isometric or ballistic exercises.
肌电图（EMG）数据的可靠性已经在等长和缓慢动态任务中进行了检查，但对于这种数据在弹道运动中的可重复性知之甚少。本研究的目的是检查在等长和弹道活动期间各种股四头肌和腘绳肌肌肉的会话内、试验间的重复性。通过组内相关系数（ICC）、受试者间变异系数（CVinter）和受试者内变异系数（CVintra）对数据进行分析。24 名受试者分别进行了 2 种随机顺序测试练习的 3 次重复，包括从深度跳跃（J）着陆和 10 米冲刺（C）后切割。使用评估肌肉的均方根 EMG 采集和处理数据，并使用重复测量方差分析对每项运动进行数据分析。结果表明，所有 ICC 值均大于 0.80，大多数值大于 0.90，CVinter 值范围为 5.4%至 148.7%，CVintra 值范围为 11.5%至 49.3%。这项研究表明，肌电图是一种可靠的方法，可用于评估在等长或弹道运动期间股四头肌和腘绳肌肌肉激活的可重复性。
