1996 Fiscal Year Final Research Report Summary
Relationship between the motoneuron pool excitability in the resting state and its amount of change during the voiuntary movement in man
| Project/Area Number |
07680126
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
体育学
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| Research Institution | School of Allied Medical Sciences, Nagasaki University |
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Principal Investigator |
FUNASE Kozo School of Allied Medical Sciences Nagasaki University Associate Professor, 医療技術短期大学部, 助教授 (40173512)
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| Co-Investigator(Kenkyū-buntansha) |
NISHIHIRA Yoshiaki Institute of Health and Sports Sciences University of Tsukuba, Associate Profess, 体育科学系, 助教授 (20156095)
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| Project Period (FY) |
1995 – 1996
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| Keywords | Motoneuron pool excitability / H-reflex / Voluntary movement / Reciprocal inhibition / Presynaptic inhibition |
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| Research Abstract |
We examined the relationship between the amount of natural reciprocal inhibition during dorsiflexion exerted at 10%, 30%, and 50% of maximal voluntary contraction (MVC) on the soleus motoneuron (MN) pool excitability of several normal subjects and their MN pool excitability in the resting state. During dorsiflexion at 10% and 30% of MVC,the inhibitory effects were decreased with increasing MN pool excitability. On the other hand, amount of presynaptic inhibition of the soleus MNs in the resting state, as assessed by vibration of the Achilles tendon, was greater in subjects with lower MN pool excitability in the resting state. These observations suggest that the decrease in MN pool excitability induced by natural reciprocal inhibition during dorsiflexion is predominantly dependent on the differences in level of presynaptic inhibition which affect MN pool excitability in the resting state.
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