Leisman G, Zenhausern R, Ferentz A, Tefera T, Zemcov A
Institute of Biomedical Engineering and Rehabilitation Services of Touro College, Dix Hills, NY 11746, USA.
Percept Mot Skills. 1995 Jun;80(3 Pt 1):963-77. doi: 10.2466/pms.1995.80.3.963.
The study investigated the effects of fatigue and task repetition on the relationship between integrated electromyogram and force output during subjective clinical testing of upper extremity muscles. Muscles were studied under two conditions differing in the nature and duration of constant force production (SHORT-F) and (LONG-F). The findings included a significant relationship between force output and integrated EMG, a significant increase in efficiency of muscle activity with task repetition, and significant difference between Force/integrated EMG ratios for muscles labeled "Strong" and "Weak" in the LONG-F condition. This supports Smith's 1974 notion that practice results in increased muscular efficiency. With fatigue, integrated EMG activity increased strongly and functional (force) output of the muscle remained stable or decreased. Fatigue results in a less efficient muscle process. Muscles subjectively testing "Weak" or "Strong" yield effects significantly different from fatigue.
该研究调查了在上肢肌肉主观临床测试期间，疲劳和任务重复对积分肌电图与力量输出之间关系的影响。在两种不同的持续力量产生性质和持续时间的条件下（SHORT - F和LONG - F）对肌肉进行了研究。研究结果包括力量输出与积分肌电图之间存在显著关系，肌肉活动效率随任务重复显著提高，以及在LONG - F条件下，标记为“强”和“弱”的肌肉的力量/积分肌电图比率存在显著差异。这支持了史密斯1974年提出的观点，即练习会提高肌肉效率。随着疲劳的出现，积分肌电图活动大幅增加，而肌肉的功能（力量）输出保持稳定或下降。疲劳导致肌肉过程效率降低。主观测试为“弱”或“强”的肌肉产生的效果与疲劳显著不同。
