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J Neurophysiol 83: 2063-2070, 2000;
0022-3077/00 $5.00
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The Journal of Neurophysiology Vol. 83 No. 4 April 2000, pp. 2063-2070
Copyright ©2000 by the American Physiological Society

Modulation of H Reflex of Pretibial Muscles and Reciprocal Ia Inhibition of Soleus Muscle During Voluntary Teeth Clenching in Humans

Yoshiyuki Takada,1 Takao Miyahara,1 Tatsuya Tanaka,1 Takashi Ohyama,1 and Yoshio Nakamura2

 1Department for Stomatognathic Dysfunction and  2Department of Physiology, Faculty of Dentistry, Tokyo Medical and Dental University, Tokyo 113-8549, Japan

Takada, Yoshiyuki, Takao Miyahara, Tatsuya Tanaka, Takashi Ohyama, and Yoshio Nakamura. Modulation of H Reflex of Pretibial Muscles and Reciprocal Ia Inhibition of Soleus Muscle During Voluntary Teeth Clenching in Humans. J. Neurophysiol. 83: 2063-2070, 2000. A previous study has demonstrated that the soleus H reflex is facilitated in association with voluntary teeth clenching in proportion with biting force in humans. The present study tried to elucidate the functional significance of this facilitation of the soleus H reflex, by examining 1) whether the facilitation of the H reflex is reciprocal or nonreciprocal between the ankle extensors and flexors and 2) whether the reciprocal Ia inhibition of crural muscles is facilitated or depressed in association with voluntary teeth clenching. The H reflex of the pretibial muscles was evoked by stimulation of the common peroneal nerve in seven healthy subjects with no oral dysfunction. The pretibial H reflex was facilitated in association with voluntary teeth clenching in a force-dependent manner. The facilitation started preceding the onset of electromyographic activity of the masseter muscle. Stimulation of the common peroneal nerve at low intensities subthreshold for evoking the M wave of the pretibial muscles inhibited the soleus H reflex after a short latency corresponding with a disynaptic inhibition, indicating that the reciprocal Ia inhibition was depressed in association with voluntary teeth clenching. Thus, the present study has shown that voluntary teeth clenching evokes a nonreciprocal facilitation of ankle extensor and flexor muscles and attenuated reciprocal Ia inhibition from the pretibial muscles to the soleus muscle. It is concluded that voluntary teeth clenching contributes to improve stability of stance rather than smoothness of movements.






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