2018 Fiscal Year Final Research Report
Modulations in corticospinal excitability accompanying contraction-mode conversion during joint movements
| Project/Area Number |
26750308
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Sports science
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| Research Institution | Waseda University (2017-2018)
The University of Tokyo (2016)
Niigata University of Health and Welfare (2014-2015) |
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Principal Investigator |
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| Research Collaborator |
Nakagawa Kento
Nakazawa Kimitaka
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| Project Period (FY) |
2014-04-01 – 2019-03-31
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| Keywords | 皮質脊髄路興奮性 / 伸張性収縮 / 短縮性収縮 |
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| Outline of Final Research Achievements |
The present study investigated phasic modulation in corticospinal excitability during wrist joint movements. Participants performed single, rapid wrist movements by resisting and lifting weights connected to a dynamometer through a pulley system. Single transcranial magnetic stimulation was applied at random times before and after wrist movement conversion. The differences between before (LEN phase) and after (CON phase) wrist movement conversion for the corresponding symmetric angles were compared. Current results suggest that during the LEN phase before the wrist movement conversion, the inhibitory component of the corticospinal pathway was relatively higher than that during SHO contractions.
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| Free Research Field |
スポーツ科学
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| Academic Significance and Societal Importance of the Research Achievements |
スポーツ活動時に多く発生する「肉離れ」の受傷には，素早い筋収縮の切り替え時に起こる神経筋協調機能の失調が密接に関与していると考えられる．本研究によって，素早い筋収縮制御時における皮質脊髄路興奮性の変調特性が明らかとなり，中枢神経系と筋がどのような機序で協調性を取り合い，筋収縮様式の素早い切り替えを遂行しているのか，その一端が明らかになった．本研究成果は、ヒトの日常動作やスポーツ活動時における中枢神経系の運動制御機構解明において重要な基礎的知見となると期待される．
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