Modulation of H reflexes in the forearm during voluntary teeth clenching in humans
- 158 Downloads
We investigated whether there is any modulation of the H reflex in the forearm during teeth clenching and how any correlation that may be found is modulated. The H reflexes of the flexor carpi radialis (FCR) and the extensor carpi radialis (ECR) muscles were evoked on the right side in five healthy adult volunteers. The H reflexes of the FCR and ECR muscles were facilitated in association with voluntary teeth clenching in a force-dependent manner (r=0.46–0.663, P<0.05). The increase in amplitude of the H reflex of the FCR muscle associated with teeth clenching started before the onset of the EMG activity of the masseter muscle. The results of the present study demonstrate that oral motor activity exerts strong influences on the motor activity of the forearm.
KeywordsExtensor carpi radialis muscle Flexor carpi radialis muscle H reflex Masseter muscle Teeth clenching
- Hayashi A, Konopacki RA, Hunker CJ (1992) Remote facilitation of H-reflex during voluntary contraction of orofacial and limb muscles. In: Stelmach GE, Requin J (eds) Tutorials in motor behavior II. Elsevier, Amsterdam, pp 475–482Google Scholar
- Takada Y, Miyahara T, Tanaka T, Ohyama T, Nakamura Y (2000) Modulation of H reflex of pretibial muscles and reciprocal Ia inhibition of soleus muscle during voluntary teeth clenching in humans. J Neurophysiol 82:2063–2070Google Scholar