| Project/Area Number |
05454528
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
補綴理工系歯学
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| Research Institution | TOKYO MEDICAL AND DENTAL UNIVERSITY |
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Principal Investigator |
OHYAMA Takashi Tokyo Med.& Dent.Univ., Fac.of Dent., Professor, 歯学部, 教授 (50064366)
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| Co-Investigator(Kenkyū-buntansha) |
NAKAMURA Yoshio Tokyo Med, & Dent.Univ., Fac.of Dent., Professor, 歯学部, 教授 (09557143)
中村 嘉男 東京医科歯科大学, 歯学部・口腔生理学講座, 教授 (10010026)
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| Project Period (FY) |
1993 – 1994
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| Project Status |
Completed (Fiscal Year 1994)
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| Budget Amount *help |
¥7,100,000 (Direct Cost: ¥7,100,000)
Fiscal Year 1994: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1993: ¥6,100,000 (Direct Cost: ¥6,100,000)
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| Keywords | Soleus / H-reflex / Rhythmical / Jaw movements / Gum chewing / Facilitation / Tonic / 前腕屈筋群 / 聴覚フィードバック / 咬合力 / 促通量 / 咀嚼リズム / 口腔機能 / 運動機能 / ヒト / H波 / 脊髄単シナプス反射 / 非相動性 |
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| Research Abstract |
We previously reported that human soleus H-reflex (S.H-R) was remarkably facilitated during teeth clenching, and that the magnitude of the facilitation increased with teeth clenching force. In this study, we investigated whether there was any modulation of S.H-R during rhythmical jaw movements with no teeth contacts (RJMs) and rhythmical gum chewing (RGC) . Experiments were carried out in 5 male volunteers (age : 22-27 years) with no stomatognathic dysfunction. The subjects were seated in a reclining armchair. Both legs were fixed with the knee and ankle joints at approximately 120ﾟ and 100ﾟ, respectively. Surface EMG was simultaneously recorded from the right soleus musle as well as the masseter and the anterior digastric muscles bilaterally. Electrical stimulation was applied to the tibial nerve at the popliteal fossa to elicit S.H-R. The subject performed self-paced RJMs and RGC.The peak-to-peak amplitude of the S.H-R during jaw movements was compared with that during maintaining the jaw at rest position. We found that (1) S.H-R was facilitated during RJMs and RGC (P<0.05, t-test) , and (2) there was no significant difference in the magnitude of the facilitation between the phase when the masseter muscle was active and that when the anterior digastric muscle was active (P>0.05, ANOVA) . It was concluded that (1) human soleus monosynaptic reflex is tonically facilitated during mastication, and (2) afferent impulses from intraoral mechanoreceptors are not indispensable for the facilitation. It is assumed that the oral motor activity exerts a strong influence on the bodily motor function in general.
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