| Project/Area Number |
09680136
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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 | Osaka University of Health and Sport Sciences |
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Principal Investigator |
FUCHIMOTO Takafumi Osaka University of Health and Sport Science, Department of Physical Education, Professor, 体育学部, 教授 (90133537)
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| Co-Investigator(Kenkyū-buntansha) |
ITO Akira Osaka University of Health and Sport Science, Department of Physical Education, Professor, 体育学部, 教授 (80067248)
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| Project Period (FY) |
1997 – 1998
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| Project Status |
Completed (Fiscal Year 1998)
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| Budget Amount *help |
¥3,100,000 (Direct Cost: ¥3,100,000)
Fiscal Year 1998: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 1997: ¥2,200,000 (Direct Cost: ¥2,200,000)
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| Keywords | running / joint moment / EMG / muscular length |
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| Research Abstract |
The muscular activity pattern and contraction velocity during the starting dash were studied. The subjects were five male sprinters, who were asked to start a dash with maximal effort from several different points in order to measure the ground reaction forces using a force platform. The movements were videotaped by a high-speed video camera. Changes in length from the origin to the insertion of eight leg muscles were calculated. The maximal contraction velocity and the turnover velocity in the stretch-shortening cycle (SSC) was calculated. The hip, knee and ankle joint torques were also calculated. (1) The m.gluteus maximus developed hip extension torque from the last half of the swing period to the foot contact period. The maximal shortening velocity increased with increasing sprint velocity. (2) The m.rectus femoris developed hip flexion torque during the first half of the swing period. The maximal stretching and shortening velocity, and the turnover velocity, increased with increasing sprint velocity. (3) The m.vastus lateralis exhibited shortening activity during the last half of the swing period and stretching activity during the first half of the foot contact period. (4) The m.biceps femoris developed hip extension torque from the middle of the swing period to the middle of the foot contact period by SSC muscular activity. The maximal stretching and shortening velocity, and turnover velocity increased with increasing sprint velocity after the start. (5) The m.gastrocnemius and m.soleus developed ankle extension torque by SSC muscular activity during the foot contact period. Although the maximal stretching velocity and turnover velocity increased, the shortening velocity stayed constant with increasing sprint velocity.
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