| Project/Area Number |
24500684
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Physical education
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| Research Institution | Japan Women's College of Physical Education |
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Principal Investigator |
KAMO Mifuyu 日本女子体育大学, 体育学部, 教授 (30224702)
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| Co-Investigator(Renkei-kenkyūsha) |
MORIMOTO Shigeru 横浜国立大学, 教育人間科学部, 教授 (70119858)
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| Research Collaborator |
CRESSWELL Ag The University of Queensland, School of human movement studies, Professor
BELLETT Mj The University of Queensland, School of human movement studies
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| Project Period (FY) |
2012-04-01 – 2015-03-31
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| Project Status |
Completed (Fiscal Year 2014)
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| Budget Amount *help |
¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2014: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2013: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2012: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
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| Keywords | 運動単位 / 放電頻度 / 多様性 / 筋力調節 / 頻度変調 |
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| Outline of Final Research Achievements |
The purpose of this study was to examine heterogeneous discharge pattern of motor units during submaximal contractions. In ramp-and-hold contractions, the discharge patterns of motor unit during the hold phase changed depending on discharge history during the ramp phase. When the subject was asked to recruit a discernible single motor unit and maintain its firing at a constant rate, the firing rates of some non-targeted motor units changed during the initial phase of the contraction, and the magnitude of surface EMG increased while the targeted motor unit maintained a constant rate. These results suggest that motor units during the initial and fatigue phase readily produce a variety of discharge pattern based on the difference of balance of synaptic input to motoneuron pool and intrinsic properties of each motoneuron.
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