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1994 Fiscal Year Final Research Report Summary

Physiological Analysis of Correlation Between Rhythmical Jaw Movements and Monosynaptic Spinal Reflex in Humans

Research Project

Project/Area Number 05454528
Research Category

Grant-in-Aid for General Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field 補綴理工系歯学
Research InstitutionTOKYO MEDICAL AND DENTAL UNIVERSITY

Principal Investigator

OHYAMA Takashi  Tokyo Med.& Dent.Univ., Fac.of Dent., Professor, 歯学部, 教授 (50064366)

Co-Investigator(Kenkyū-buntansha) NAKAMURA Yoshio  Tokyo Med, & Dent.Univ., Fac.of Dent., Professor, 歯学部, 教授 (09557143)
Project Period (FY) 1993 – 1994
KeywordsSoleus / H-reflex / Rhythmical / Jaw movements / Gum chewing / Facilitation / Tonic
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.

  • Research Products

    (6 results)

All Other

All Publications (6 results)

  • [Publications] 萩谷 昇: "リズミカルな顎運動時にみられる脊髄単シナプス反射の変調に関与する神経機構" 歯科基礎医学会雑誌. 35. 221 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] HAGIYA,N.: "MODULATION OF SPINAL MONOSYNAPTIC REFLEXES DURING RHYTHMICAL JAW MOVEMENTS." Jpn.J.Physiol.44. S217 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 萩谷 昇: "リズミカルな顎運動時の脊髄単シナプス反射の変調とその神経機構" 口腔病学会雑誌. 61. 21-38 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] HAGIYA,N.et al.: "Central Neural Mechanisms Reponsible for Modulation of Spinal Monosynaptic Reflexes During Rhythmical Jaw Movements" Jpn.J.Oral Biol.35, Suppl. 221 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] HAGIYA,N.et al.: "MODULATION OF SPINAL MONOSYNAPTIC REFLEXES DURING RHYTHMICAL JAW MOVEMENTS.Jpn." J.Physiol.44, Suppl.1. 217 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] HAGIYA,N.: "Modulation of Spinal Monosynaptic Reflexes During Rhythmical Jaw Movements and Its Central Neural Mechanisms" J.Stomatol.Soc.Jpn.61,1. 21-38 (1994)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1996-04-15  

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