EFFECT OF FATIGUE ON FORCE SENSATION
EFFECT OF FATIGUE ON FORCE SENSATION
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DOI：
10.1016/0014-4886(83)90332-1
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发表时间：
1983-01-01
影响因子：
5.3
通讯作者：
HUNTER, IW
中科院分区：
文献类型：
--
作者：
JONES, LA;HUNTER, IW
最近的实验表明，努力的感觉可以与肌肉收缩中的力量或张力的感觉分开。在次最大疲劳收缩期间检查了这种区别的证据。受试者被要求保持直到最大耐力恒定的等长力与他们的权利，参考手臂，并在15秒的时间间隔，他们估计这个力的大小与匹配的收缩对侧arm.The匹配的力量产生的unfatigued肢体的力量感觉的措施。记录每只手臂的力量和肱二头肌和肱三头肌的肌电图[脊髓电图]。在疲劳收缩期间，匹配的力量线性增加，疲劳肌肉的二头肌肌电图也线性增加。增加的速度取决于施加的力的大小。参考臂肌电和感知力之间的线性关系被观察到，这表明力的高估是由于增加兴奋输入到疲劳肌肉。这些结果提供了一个中枢介导的力觉理论的支持，并表明，在疲劳受试者无法准确估计的收缩力。显然，在这些条件下，紧张感与努力感是无法区分的。
Recent experiments have suggested that a sense of effort can be separated from a sense of developed force or tension in muscular contractions. The evidence for this distinction was examined during submaximal fatiguing contractions. Subjects were required to maintain until maximal endurance a constant isometric force with their right, reference arm, and at 15-s intervals they estimated the magnitude of this force with a matching contraction of the contralateral arm. The matching force produced by the unfatigued limb was the measure of the force sensation. Both force and the brachial biceps and triceps EMG [electromyelogram] were recorded from each arm. During the fatiguing contractions the matching force increased linearly as did the biceps EMG of the fatiguing muscle. The rate of increase was dependent on the level of force exerted. A linear relation between the reference arm EMG and the perceived force was observed, which suggested that the over-estimation of force was due to the increase in the excitatory input to the fatiguing muscle. These results provide support for a centrally mediated theory of force perception, and indicate that during fatigue subjects are unable to estimate accurately the force of contraction. Evidently under those conditions a sense of tension is not distinguishable from a sense of effort.