2021 Fiscal Year Final Research Report
Relationship between pre- and post-entry water motion and fluid force during a swimming start and construction of a Minimum deceleration model
Project/Area Number |
18K17849
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Research Category |
Grant-in-Aid for Early-Career Scientists
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Allocation Type | Multi-year Fund |
Review Section |
Basic Section 59020:Sports sciences-related
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Research Institution | International Pacific University (2020-2021) National Agency for the Advancement of Sports and Health (2018-2019) |
Principal Investigator |
Akashi Keita 環太平洋大学, 体育学部, 助教 (10740160)
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Project Period (FY) |
2018-04-01 – 2022-03-31
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Keywords | 迎角 / 角運動量 / 姿勢制御 |
Outline of Final Research Achievements |
This study examined the effects of the block phase, flight phase, and entry phase movement on the deceleration the glide phase during the starting phase. The results revealed that Vh (horizontal velocity) during the glide phase is determined by Vh at the completion of water entry, and that Vh at the completion of water entry is affected by Vh at the start of water entry and the segment angle of attack during the entry phase. In addition, angular momentum during the flight phase affected the segment angle during the entry phase, and swimmers who were able to acquire large angular momentum were characterized as exerting greater force in the early block phase.
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Free Research Field |
バイオメカニクス
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Academic Significance and Societal Importance of the Research Achievements |
1.グライド期の水平速度を高く保つにはエントリー期初期のセグメントの前傾を保つ必要があり、これにはフライト期の角運動量が関連している。フライト期の角運動量がエントリー期の姿勢や迎角に影響することを初めて明らかにすることができた。エントリー期の姿勢制御を適正化するためにはフライト期の角運動量に着目することが必要と示された。 2.角運動量の重要性が明らかになったことで、ブロック期では水平速度だけでなく、角運動量も大きくすることが必要となり、ブロック期研究の新たな視点を提供することができた。
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