Pincivero D M, Gear W S, Sterner R L
Human Performance and Fatigue Laboratory, Department of Physical Therapy, Eastern Washington University, Cheney, WA 99004, USA.
Med Sci Sports Exerc. 2001 Feb;33(2):334-8. doi: 10.1097/00005768-200102000-00025.
The purpose of this study was to evaluate test-retest reliability of two different measures of isokinetic quadriceps muscle fatigue.
Subjects for this study included 16 healthy, college age volunteers. Each subject performed 30 maximal, concentric repetitions on the Biodex System II Isokinetic Dynamometer at a preset angular velocity of 180 degrees.s(-1) for both the dominant and nondominant legs. Quadriceps work was evaluated between an angular range of 10 degrees and 60 degrees of flexion for each repetition. Quadriceps muscle fatigue was calculated through a fatigue index (work performed last 5 repetitions/work performed first five repetitions x 100) and the linear slope (beta) across the 30 repetitions. The subjects participated in two test sessions separated by one to two weeks. Intraclass correlation coefficients (ICC) and standard errors of measurements (SEM) were calculated for each fatigue measure on both legs.
The findings demonstrated moderate to high ICCs for the nondominant leg (ICC = 0.78--0.92) and high ICCs for the slope and y-intercept for the dominant leg (ICC = 0.82 and 0.89, respectively). The fatigue index for the dominant leg was found to be low (ICC = 0.26).
The findings of this study suggest that the quantification of muscle fatigue during high-intensity, short-term exercise is more reliably described by the slope, which is related to the magnitude of force output.
本研究旨在评估两种不同的等速股四头肌疲劳测量方法的重测信度。
本研究的受试者包括16名健康的大学生志愿者。每位受试者在Biodex System II等速测力计上，以180度·秒⁻¹的预设角速度，对优势腿和非优势腿各进行30次最大程度的向心重复动作。每次重复动作时，在10度至60度的屈曲角度范围内评估股四头肌的做功情况。通过疲劳指数（最后5次重复动作的做功量/前5次重复动作的做功量×100）和30次重复动作的线性斜率（β）来计算股四头肌疲劳程度。受试者参加两次测试，间隔一至两周。计算双腿上每项疲劳测量指标的组内相关系数（ICC）和测量标准误差（SEM）。
研究结果表明，非优势腿的ICC为中度到高度（ICC = 0.78 - 0.92），优势腿斜率和y轴截距的ICC为高度（分别为ICC = 0.82和0.89）。优势腿的疲劳指数较低（ICC = 0.26）。
本研究结果表明，在高强度、短期运动期间，肌肉疲劳的量化通过与力输出大小相关的斜率能得到更可靠的描述。
