| Project/Area Number |
24300215
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Partial Multi-year Fund |
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| Section | 一般 |
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| Research Field |
Sports science
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| Research Institution | University of Tsukuba |
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Principal Investigator |
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| Co-Investigator(Kenkyū-buntansha) |
NAKASHIMA Motomu 東京工業大学, 大学院情報理工学研究科, 教授 (20272669)
MIYOSHI Tasuku 岩手大学, 工学部, 准教授 (10392193)
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| Research Collaborator |
SHIMOJO Hirofumi
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| Project Period (FY) |
2012-04-01 – 2015-03-31
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| Project Status |
Completed (Fiscal Year 2014)
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| Budget Amount *help |
¥9,620,000 (Direct Cost: ¥7,400,000、Indirect Cost: ¥2,220,000)
Fiscal Year 2014: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Fiscal Year 2013: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2012: ¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
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| Keywords | 水中ドルフィンキック / 三次元動作分析 / 水中モーションキャプチャー / 水中筋電 / 身体感覚 / 運動制御 / ドルフィンキック / 水中動作分析 / 推進効率 / 流れ場解析 / 回流水槽 / 水中モーションキャプチャ |
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| Outline of Final Research Achievements |
Undulatory underwater swimming (UUS) is an important swimming technique after a start and after turns. It was considered that a higher swimming velocity (U) resulted from a higher kick frequency (f), and greater propelling efficiency, i.e., Strouhal number (St) and Froude efficiency (ηF), resulted from a lower f. The aim of this study was to investigate whether changing f affected U and St, ηF plus other kinematics of UUS.
In conclusion, increasing f did not affect U, but decreasing f significantly decreased U. Depending on the swimmer, it was expected that incremental changes in kick frequency may increase the average U, in fact there were three swimmers whose average swimming velocity was improved. Decreasing f had no effect on either ηF or St; however, increasing f had a negative effect on ηF. As for human undulation mode, the wavelength per body length significantly decreased while ηF maintaining , which means a decrement in f seems to be suitable for human undulation training.
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