| Project/Area Number |
14580066
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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 | Meiji University |
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Principal Investigator |
MIZUMURA Shinji Meiji University, School of Arts and Letters, Associate Professor, 文学部, 助教授 (50267358)
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| Project Period (FY) |
2002 – 2004
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| Project Status |
Completed (Fiscal Year 2004)
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| Budget Amount *help |
¥3,400,000 (Direct Cost: ¥3,400,000)
Fiscal Year 2004: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 2003: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 2002: ¥2,000,000 (Direct Cost: ¥2,000,000)
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| Keywords | Motor unit / recruitment threshold / firing rate / Vastus medialis muscle / Quadrifilar wire electrode / 動員闘値 / 脱動員闘値 / 脱動員閾値 |
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| Research Abstract |
Purpose of the present research was to elucidate the motor unit firing behaviors in various human muscles during voluntary isometric force exertion. First, I improved the quadrifilar needle electrode which is used in the precision decomposition technique. As a result, the quadrifilar wire electrode which can detect the intra-muscular myoelectric signal of vastus medialis muscle was produced. Next, the recruitment threshold, the de-recruitment threshold, and the firing rate of the motor unit in the vastus medialis muscle were verified. The positive correlation was observed between the recruitment and de-recruitment threshold of the motor units. The negative correlation was observed between the recruitment threshold and the firing frequency of the motor units. These results indicate that the concept of the "Onion skin phenomenon" is also adapted in the vastus medialis muscle.
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