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《Chinese Journal of Sports Medicine》 2004-01
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Changes in H Wave of Evoked EMG in Soleus Muscle during Tibialis Anterior Muscle Fatigue and Its Mechanism

Wang Guoxiang 1 and Kiyoshi Onari 2 1 Physical Education College,Soochow University, Suzhou 215021, China 2 Institute of Health Sciences, School of Medicine, Hiroshima University,Hiroshima, Japan  
To find out the rules of changes in excitability of antagonist spinal motor neurons when the muscle fatigue of agonist occurs, ankle joint dorsal flexion form was applied to investigate the soleus muscle H wave under the state of tibialis anterior muscle fatigue. We analyzed and explored the mechanism of the changing by using the method of pressing and blocking the conduction of Ia afferent fibers of tibialis anterior muscle. Results were: (1)soleus muscle H wave was inhibited obviously under the state of tibialis anterior muscle fatigue and the difference was significant when compared with the quiet state. (2)after the conduction of Ia afferents tibialis anterior muscle was blocked, the inhibiting phenomenon of H wave of soleus muscle did not disappear. Accordingly, we conclude that under the state of agonist fatigue, the reason for inhibition of antagonist spinal neurons may due to the activation of the receptors of Ⅲ·Ⅳ afferent fibers by metabolic products of agonist, and thus enable the Ⅲ·Ⅳ afferent fibers to increase the afferent impulse, activate the Ia inhibitory interneurones and finally inhibit the excitability of spinal motor neurons of antagonist.
【CateGory Index】: R87
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