| Project/Area Number |
24700692
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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 | International Budo University |
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Principal Investigator |
JINJI Tsutomu 国際武道大学, 体育学部, 助教 (20387616)
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| Project Period (FY) |
2012-04-01 – 2014-03-31
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| Project Status |
Completed (Fiscal Year 2013)
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| Budget Amount *help |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2013: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2012: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
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| Keywords | 投球 / スナップ / エネルギー / マルチボディダイナミクス / ボールスピン / 野球 / ピッチング / 二重振り子 / エネルギーフロー |
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| Research Abstract |
Some studies have reported that movements of forearm and wrist has several rolls to perform a baseball pitching. However dynamical mechanism are still unclear. As a step toward understanding the rolls of forearm and hand in baseball pitching, we investigated how non-muscular forces of the each link generates, absorbs, and transfers mechanical energy in order to produce maximum velocity. The mechanical energy of the hand was supplied the non-muscular force, which is governed by the centrifugal force of the forearm. However, the muscle torque of the wrist absorbs the mechanical energy of the hand. It is concluded that only the wrist cannot generate a high ball velocity. The wrist, therefore, is equipped with a self-defense mechanism and provides a relatively stable base for extrinsic finger control. It is also thought that the wrist joint have a roll to apply spin a ball. The wrist joint may contribute to the rotational velocity and not the translational velocity of a ball.
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