2023 Fiscal Year Final Research Report

Development of a new hydrodynamic analysis method for swimming underwater motion and elucidation of its mechanism

Research Project

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Project/Area Number	20H04064
Research Category	Grant-in-Aid for Scientific Research (B)
Allocation Type	Single-year Grants
Section	一般
Review Section	Basic Section 59020:Sports sciences-related
Research Institution	University of Tsukuba
Principal Investigator	TAKAGI Hideki 筑波大学, 体育系, 教授 (80226753)
Co-Investigator(Kenkyū-buntansha)	角川隆明筑波大学, 体育系, 助教 (00740078) 中島求東京工業大学, 工学院, 教授 (20272669) 仙石泰雄筑波大学, 体育系, 准教授 (30375365) 下門洋文新潟医療福祉大学, 健康科学部, 講師 (50757911)
Project Period (FY)	2020-04-01 – 2024-03-31
Keywords	水泳 / 流体力学 / バイオメカニクス / 流れの可視化 / コンピュータシミュレーション / 最適化
Outline of Final Research Achievements	Swimming in water is expected to provide exercise benefits that cannot be achieved on land, but how and to what extent do the forces received from the water act on the organism when humans exercise in water? However, how and to what extent the forces received from the water act on the body when humans exercise in water is not fully understood. The aim of this study was to elucidate the mechanism of hydrodynamic force generation during swimming, which has been considered difficult, by combining several state-of-the-art hydrodynamic analysis methods. As a result, it was shown for the first time that, in contrast to the generation mechanism assuming a quasi-steady state, the unsteady flow due to vortex generation induces a sudden drop in pressure (negative pressure) on the back surfaces of the hands and feet, resulting in a large hydrodynamic force.
Free Research Field	バイオメカニクス
Academic Significance and Societal Importance of the Research Achievements	これまでに独自に開発をしてきた水泳水中運動における先端的な計測技術を融合し，新たな方法論を確立することを目指した．学術的意義としては，ヒトの水泳水中運動について，流体工学，バイオメカニクス，計算科学などのさまざまの学問領域の知見を統合することより，新たな学際領域の創成へとつながることが期待される．また社会的意義としては，老若男女を問わず，競技，リクリエーション，リハビリ等，幅広い目的で実施される水泳水中運動において，生体への負荷量を正確に定量できる方法論を確立することで，水中リハビリテーションにおける運動処方の指標，あるいはトップスイマーの傷害予防などの指針となる知見を得ることが期待される．