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Clarifying the relation between force and flow during undulatory underwater swimming

Research Project

Project/Area Number 16K16540
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Sports science
Research InstitutionNiigata University of Health and Welfare

Principal Investigator

Shimojo Hirofumi  新潟医療福祉大学, 健康科学部, 講師 (50757911)

Project Period (FY) 2016-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥3,900,000 (Direct Cost: ¥3,000,000、Indirect Cost: ¥900,000)
Fiscal Year 2018: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2017: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2016: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Keywords水泳 / PIV / モーションキャプチャ / 筋電図 / 圧力 / 回流水槽 / 水中運動 / 流体 / コーチング
Outline of Final Research Achievements

We have developed a new method for three-dimensionally visualizing the flow around the swimmer's hand and foot using Particle Image Velocimetry (PIV) used in the field of fluid dynamics. Using this method, the swimmer's propulsion mechanism was investigated, and the swimmer performed complex limb-movements such as changing the stroke direction or rotation of the limb in the water, and this movement generates a vortex around the limb, It is suggested that this vortex may be the source of propulsion. Also, this vortex reflects the magnitude of the propulsive force, so if the method of this study is developed, it will be possible for the swimmer to estimate the degree of force obtained from the water.

Academic Significance and Societal Importance of the Research Achievements

これまで、水泳の腕のかきのことを「水を押す」と表現されていたが、実際には押しておらず渦を作り出して手足の周りに圧力差を生み出し、スイマーはこれを推進に利用して遊泳している。ヒトが速く泳ぐためには、作用反作用のように力任せに水を押せば進めるのではなく、渦をどうやって作るかがカギとなり、水泳指導法のパラダイムシフトにつながる。

Report

(4 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Research-status Report
  • 2016 Research-status Report
  • Research Products

    (5 results)

All 2018 2017 2016 Other

All Int'l Joint Research (1 results) Journal Article (1 results) (of which Peer Reviewed: 1 results) Presentation (3 results) (of which Int'l Joint Research: 3 results)

  • [Int'l Joint Research] The University of Sydney(オーストラリア)

    • Related Report
      2018 Annual Research Report
  • [Journal Article] 泳者周りの流れ場の可視化2018

    • Author(s)
      下門 洋文, 高木 英樹
    • Journal Title

      バイオメカニクス研究

      Volume: 21 Pages: 180-188

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Presentation] Shedding vortex and pressure pattern around the foot in undulatory underwater swimming2018

    • Author(s)
      Hirofumi Shimojo, Rina Ebihara, Kenzo Narita, Tomohiro Gonjo, Yasuo Sengoku, Shozo Tsubakimoto, Hideki Takagi.
    • Organizer
      XIIIth International Symposium for Biomechanics and Medicine in Swimming
    • Related Report
      2018 Annual Research Report
    • Int'l Joint Research
  • [Presentation] THREE-DIMENSIONAL FLOW FIELD AND LEG MOTION DURING UNDULATORY UNDERWATER SWIMMING.2017

    • Author(s)
      Hirofumi Shimojo, Ryo Murakawa, Rio Nara, Yasuhiro Baba, Yasuo Sengoku, Jun Sakakibara, Yoshimitsu Shimoyama, Shozo Tsubakimoto, Hideki Takagi.
    • Organizer
      35th International Conference on Biomechanics in Sports.
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] A FLOW VISUALIZATION OF UNDULATORY UNDERWATER SWIMMING -A PILOT STUDY OF THREE DEIMENTIONAL ANALYSIS-2016

    • Author(s)
      Hirofumi Shimojo, Ryo Murakawa, Yasuo Sengoku, Jun Sakakibara, Shozo Tsubakimoto, Hideki Takagi
    • Organizer
      34th International Conference on Biomechanics in Sports
    • Place of Presentation
      筑波大学(茨城県・つくば市)
    • Year and Date
      2016-07-18
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research

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Published: 2016-04-21   Modified: 2020-03-30  

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