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- Hirabayashi Ryo
- Institute for Human Movement and Medical Sciences, Niigata University of Health and Welfare
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- Edama Mutsuaki
- Institute for Human Movement and Medical Sciences, Niigata University of Health and Welfare
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- Onishi Hideaki
- Institute for Human Movement and Medical Sciences, Niigata University of Health and Welfare
Bibliographic Information
- Other Title
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- 脊髄相反性抑制に着目した力みのメカニズムの解明
- セキズイソウ ハン セイ ヨクセイ ニ チャクモク シタ リキミ ノ メカニズム ノ カイメイ
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Abstract
<p>Excessive co-contraction interferes with smooth joint movement via mechanisms including failed spinal reciprocal inhibition against antagonists. However, the function of spinal reciprocal inhibition during co-contraction remains unclear. To investigate the influence of changes in contraction intensity during co-contraction on spinal reciprocal inhibition, 20 healthy adults were subjected to four stimulation conditions: a conditioning stimulus?test stimulation interval (CTI) of −2, 2, or 20 ms or a test stimulus without a conditioning stimulus (single).Co-contraction (change in soleus muscle [Sol] vs. tibialis anterior [TA] activity) was examined at task A 0% vs. 0% maximal voluntary contraction (MVC), task B 5% vs. 5% MVC, task C 15% vs. 15% MVC, task D 5% vs. 15% MVC, and task E 15% vs. 5% MVC.At CTI of 2 ms, the H-reflex amplitude value was significantly lower in tasks A, B, C, and D than in the single condition. Among the tasks, the H-reflex amplitude values were lower for A, B, C, and D than for E. At CTI of 20 ms, the H-reflex amplitude was significantly lower in tasks A, B, C, D, and E. Among the tasks, the H-reflex amplitude was significantly lower from task A and B to task E. For co-contraction <15% MVC, reciprocal Ia inhibition may be modulated depending on the Sol vs. TA muscle activity ratio. D1 inhibition was equivalent when the Sol/TA ratio was equal or TA muscle activity was high. During co-contraction with high Sol muscle activity, D1 inhibition decreased from rest but D1 inhibition remained.</p>
Journal
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- DESCENTE SPORTS SCIENCE
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DESCENTE SPORTS SCIENCE 41 (0), 175-184, 2020-09-07
THE DESCENTE AND ISHIMOTO MEMORIAL FOUNDATION FOR THE PROMOTION OF SPORTS SCIENCE
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Details 詳細情報について
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- CRID
- 1390859758186687104
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- NII Article ID
- 40022368948
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- NII Book ID
- AN00357177
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- ISSN
- 27584429
- 02855739
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- NDL BIB ID
- 030675402
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- Text Lang
- ja
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- Data Source
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- JaLC
- NDL
- CiNii Articles
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- Abstract License Flag
- Disallowed