人体固定后运动单位数量的短暂减少。
Transient decrease in number of motor units after immobilisation in man.
作者信息
Fuglsang-Frederiksen A, Scheel U
出版信息
J Neurol Neurosurg Psychiatry. 1978 Oct;41(10):924-9. doi: 10.1136/jnnp.41.10.924.
On the day after the removal of a long leg cast, when the patient could just bend his knee, the electrical activity in the disused quadriceps muscle showed changes that indicated a reduction in the number of motor units. At 10 to 75% of maximum force the number of turns and the mean amplitude of the needle-recorded EMG were reduced in the disused muscle. Eight days later, when half the initial loss of force had been regained, the electrical activity was normal. The electrical activity produced during a constant force of 5 kg did not differ in the disused and in the contralateral muscle. From the findings in normal subjects it was deduced that the compensatory increase in turns in the EMG pattern to be expected from the decrease in cross-sectional area of the muscle fibres was within the error of the method. The transient decrease in the number of turns and in mean amplitude of the EMG of the disused muscle are an indication of the plasticity of the motor system.
在拆除长腿石膏后的第二天，当患者刚能弯曲膝盖时，废用的股四头肌的电活动显示出变化，表明运动单位数量减少。在最大力量的10%至75%时，废用肌肉中针电极记录的肌电图的波峰数量和平均波幅降低。八天后，当恢复了初始力量损失的一半时，电活动恢复正常。在5千克恒定力量下产生的电活动在废用肌肉和对侧肌肉中没有差异。从正常受试者的研究结果推断，由于肌纤维横截面积减小而预期的肌电图波峰数量的代偿性增加在该方法的误差范围内。废用肌肉的肌电图波峰数量和平均波幅的短暂降低表明运动系统具有可塑性。
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