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1997 Fiscal Year Final Research Report Summary

Neural mechanisms of anticipatory postural adjustment in human

Research Project

Project/Area Number 07680119
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 体育学
Research InstitutionHIROSHIMA UNIVERSITY

Principal Investigator

KASAI Tatsuya  Hiroshima University, Graduate School of International Development and Cooperation, Professor, 大学院・国際協力研究科, 教授 (60112702)

Project Period (FY) 1995 – 1997
KeywordsAnticipatory postural adjustment / H-reflex / voluntary arm movement / Freely standing / electromyogram / Human
Research Abstract

A biomechanical and neurophysiological analysis of anticipatory postual adjustments associated with the early phase of a voluntary arm movement was carried out in normal subjects. Arm elevation, performed at maximal velocity, was studied with unilateral arm movement in freely and counterbalanced (suspended in a safety harness) standing humans. The ground reaction force of both legs, tengential acceleration of the shank and electromyographic (EMG) activity of the anterior deltoid (AD), biceps femoris (BF) and soleus (Sol) muscles were recorded. Sol H-reflex of both legs were also elicited. In this study, we systematically investigated biomechanical and EMG phenomena that precede and follow the onset of voluntary arm movements. Prior to and during the arm movement (i.e., AD activity), a sequence of EMG modofications occurred in ipsilateral BF and Sol muscles. Those modifications preceding BF activity included silent phases in Sol EMG and depression of Sol H-reflexes. By comparing EMG modifications with depression of the Sol H-reflex, we conclude that Ia and presynaptic inhibitory pathways do not play a specific role in those Sol H-reflex depression. Moreover, because Sol H-reflex depression occurs in both freely standing and counterbalanced postures, anticipatory postural adjustment appear to be preprogramd in the central neuvous systems unrelated to peripheral neural mechanisms. Since changes of EMG activities of ipsilateral BF and Sol appeared simultaneously and Sol H-reflex depressions were dependent on EMG activities of ipsilateral BF,control commands to anticipatory postural adjustment would excite BF and inhibit Sol.

  • Research Products

    (8 results)

All Other

All Publications (8 results)

  • [Publications] J.G.Anson & T.Kasai: "Evidence for soleus H-reflex depression induced by ballistic head rotanion." Neuroscience Letters. 195. 17-20 (1995)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Kasai: "Anticipatory postural mechanisms; Some evidence and methodoloqical implications." Behavioral Brain Sciences. 19. 77-78 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.Kasai & T.Komiyama: "Soleus H-reflex depression induced by ballistic voluntary arm movements in human." Brain Research. 714. 125-134 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] T.KASAI et al.: "Posture-dependent modulation of reciprocal inhibition upon initiation of ankle dorsiflexion in man." Brain Research. (in press).

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] J.G.Anson and T.Kasai: "Evidence for soleus H-reflex depression induced by ballistic head rotation." Neuroscience Letters. 195. 17-20 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Kasai: "Anticipatory postural mechanisms ; Some evidence and methodological implications" Behavioral Brain Sciences. 19. 77-78 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Kasai and T.Komiyama: "Soleus H-reflex depression induced by ballistic voluntary arm movement in human" Brain Research. 714. 125-134 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] T.Kasai, M.Kawanishi and S.Yahagi: "Posture-dependent modulation of reciprocaql inhibition upon initiation of ankle dorsiflexion in man" Brain Research. (in press). (1998)

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

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Published: 1999-03-16  

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