WORK LOAD AND FATIGUE IN REPETITIVE ARM ELEVATIONS
WORK LOAD AND FATIGUE IN REPETITIVE ARM ELEVATIONS
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DOI：
10.1080/00140138108924875
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发表时间：
1981-01-01
期刊：
影响因子：
2.4
通讯作者：
HAGBERG, M
中科院分区：
文献类型：
--
作者：
HAGBERG, M
6只雌性动物在0至90度之间进行连续系列的肩部同心和偏心屈曲，并在Powergrip中保持0至3.1 kg的重量。在任务期间测量心率（HR）、感觉用力（RPE）和肱二头肌、三角肌前部和肱二头肌降部的肌电活动（EMG）。RPE的增加快于HR随工作负荷的增加，表明局部因素（即肌肉和肌腱的应变）随负荷在感知的用力中的重要性增加。肌电测定的肘肌局部肌肉负荷与盂肱关节产生的外扭矩密切相关。肌电幅值增加的时间常数与工作负荷、耐力时间以及RPE-HR线性回归的斜率系数相关。任务后24小时的症状和抱怨往往局限于肌肉的下降部分。有人建议，行使的降部的斜方肌的任务，涉及重复的肩部屈曲可能会促进不适和投诉提到的颈部。
Six females performed continuous series of concentric and eccentric flexions in the shoulder between 0 and 90 degrees with 0 to 3.1 kg weights held in a powergrip. Heart rate (H R), perceived exertion (RPE) and myoelectric activity (EMG) from the descending part of the trapezius muscle, the anterior part of the deltoid muscle, and the biceps brachii were measured during the tasks. The increase of RPE was faster than the increase of HR with work load indicating an increased importance of local factors (i.e. strain on muscles and tendons) with load in the perceived exertion. The local muscular load determined by EMG on the trapezius muscle was closely correlated with the external torque produced in the glenohumeral joint. The time constants of EMG amplitude increase were correlated with work load, endurance time and with slope coefficients of RPE-HR linear regression. Symptoms and complaints 24 hours after the task were often localized to the descending part of the trapezius muscle. It is suggested that exertion of the descending part of the trapezius muscle in tasks involving repetitive shoulder flexion may promote discomfort and complaints referred to the neck.