2022 Fiscal Year Final Research Report

Development of the specialized technical training for underwater dolphin kick.

Research Project

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Project/Area Number	20K11430
Research Category	Grant-in-Aid for Scientific Research (C)
Allocation Type	Multi-year Fund
Section	一般
Review Section	Basic Section 59020:Sports sciences-related
Research Institution	Niigata University of Health and Welfare
Principal Investigator	Yusuke Ikeda 新潟医療福祉大学, 健康科学部, 准教授 (10455446)
Co-Investigator(Kenkyū-buntansha)	下山好充新潟医療福祉大学, 健康科学部, 教授 (20375364) 市川浩西九州大学, 健康福祉学部, 准教授 (20375463) 馬場康博新潟医療福祉大学, 健康科学部, 講師 (50592614) 奈良梨央新潟医療福祉大学, 健康科学部, 講師 (70708148)
Project Period (FY)	2020-04-01 – 2023-03-31
Keywords	競泳 / 技術トレーニング / コーチング / 動作分析
Outline of Final Research Achievements	The present study verified the imitation dolphin kick training for achieving performance improvement. Nine male competitive swimmers performed 15-m dolphin kick swimming trials with maximum effort. The movements of the underwater and imitation dolphin kicks performed 4 kick rates using a tempo device were recorded using a digital video camera for a two-dimensional motion analysis. The angular velocity of the lower trunk during the down kick phase in the imitation dolphin kick at 2 Hz correlated with the performance (r = -0.793, P <0.05) and the angular displacement of the lower trunk during the acceleration phase (r = 0.709, P <0.05) in the underwater dolphin kick. Furthermore, faster swimmers moved the lower and upper trunks separately, and did not move the lower leg swiftly. These results suggest that the imitation dolphin kick training focused on the trunk movement at the appropriate kick rate on land may be a specific technical training for the underwater dolphin kick.
Free Research Field	トレーニング科学
Academic Significance and Societal Importance of the Research Achievements	競泳のコーチングでは「水を押す」、「水をつかむ」といった感覚的な表現にジェスチャーを交えてストロークの指導がなされることがあるが、ドルフィンキックの技術指導においても動作分析データなどの客観的情報と指導者や選手の持つ主観的情報を組み合わせることで、技術指導において求められる指導言語や実践知を提供できると考える。過去に模擬動作を用いてスポーツ動作の変容過程に着目した研究はなく、技術改善のための方法論およびその開発のプロセスを示すことができれば、他競技への応用・発展も可能になると考えられる。