| （苏州大学 体育学院，江苏 苏州 215021） 摘要：为了解肌肉疲劳时神经肌肉系统兴奋性的变化规律，以10名健康男子为对象，采用随意性最大的肌肉收缩（V组）和电刺激诱发肌肉收缩（E组）的两种运动形式，对足背屈运动引起胫骨前肌疲劳时的胫骨前肌和比目鱼肌的表面肌电图(sEMG)和诱发肌电图（evoked EMG）进行了观察。结果发现：（1）V组和E组的sEMG积分值和平均频率均出现了降低的趋势，而且E组的变化较为明显；（2）E组的胫骨前肌（主动肌）Mmax和H/Mmax明显降低下，比目鱼肌（拮抗肌）Mmax和H/Mmax在胫骨前肌疲劳后则无明显变化；（3）V组胫骨前肌与比目鱼肌的H/Mmax在疲劳发生后均表现出显著低下,但二者的Mmax却无明显变化。结论：肌疲劳时不但主动肌脊髓运动神经元受到了抑制，拮抗肌脊髓运动神经元也受到了类似的影响，但由于肌肉收缩方式不同而上述变化并不完全一致。 关 键 词：随意运动； 电刺激； 疲劳； 表面肌电图； 诱发肌电图 中图分类号：G804.7 文献标识码：A 文章编号：1006-7116(2007)01-0056-04 |
WANG Guo-xiang，YUE Chun-lin
| （College of Physical Education Soochow University，Suzhou 215021, China） Abstract: In order to gain an insight into the pattern of changes of excitability of the neuro-muscular system, the authors based their object on 10 healthy males and applied two types of motion forms, namely, muscular contraction with maximum voluntary degree (group V) and muscular contraction induced by electric stimulation (group I), to observes the superficial electromyogram (sEMG) and induced electromyogram (iEMG) of tibial anterior muscle and soleus muscle when tibial anterior muscle fatigued as a result of ankle joint dorsal flexion, and revealed the follow-ing findings: 1) a decreasing trend occurred to the integral quantity and mean frequency of sEMG of testees in groups V and I, and such changes of testees in group I were more obvious; 2) with respect to testees in group I, the Mmax and ratio H/Mmax of tibial anterior muscle (agonist) were significantly lowered, and there was no significant change to the Mmax and ratio H/Mmax of soleus muscle (antagonist) after tibial anterior muscle fatigued; 3) with re-spect to testees in group V, ratio H/Mmax of tibial anterior muscle and soleus muscle was significantly lowered after the occurrence of muscle fatigue, but there was no significant change to the Mmax of both muscles. Conclusions: When the muscle fatigued, not only the spinal motor neurons of the agonist were restrained, but also the spinal mo-tor neurons of the antagonist were affected similarly, but the said changes were not completely the same due to the difference between muscular contraction modes. Key words: voluntary motion; electric stimulation; fatigue; superficial electromyogram; induced electromyogram |
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