ハンマー投げ記録とハンマーヘッド速度の関係  [in Japanese] Relationship between hammer throw performance and hammer head velocity  [in Japanese]

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Abstract

4ターン投法でパフォーマンスが異なる (世界のトップレベルから地方学生レベルまで) 26名の成人男子ハンマー投げ選手の公式競技会における投てきのハンマーヘッドの運動を三次元解析し, 以下の結果を得た.<br>記録の良い選手ほどヘッドの初速度が高い傾向にあったが (r=0.917, p<0.001), 記録とリリース高および投射角との間には有意な相関関係が認められなかった. すべてのターンにおけるヘッド速度の最大値と最小値は記録との間で有意な正の相関関係が認められた. 指導現場では1ターン目は速度を遅くし, 徐々に加速するように指導する傾向があるが, 本研究の結果では優秀選手が速い回転速度で1ターン目を開始しており, 異なる結果を得た. また, 指導現場ではヘッドの軌道を規定する曲率半径を大きくするように指導がなされる場合があるが, 本研究の結果では曲率半径が短い局面でヘッドが加速しており, また曲率半径が短い局面で法線加速度が増加する傾向が観察された. そして, 記録の良い選手ほど法線加速度が高く, 法線加速度の発揮速度も高かった.<br>以上の結果を先行研究を参考にまとめると, ハンマー投げの選手は回転の中心方向にヘッドを引くことによって法線加速度を高め, その結果曲率半径が減少しながらヘッドを加速する可能性が示唆された.

A study was conducted to clarify the relationship between hammer throw performance and hammer head velocity during four-turn throwing. Hammer head movements of 26 male hammer throwers including from world's top-ranking athlete down to unskilled level performing the four-turn throwing method were filmed at 60 fps using two video cameras at five athletic competitions. The hammer head was digitized and the three-dimensional coordinates were calculated using the DLT method. The results revealed a significant positive correlation between throw distance and the initial velocity of the hammer head (r=0.917, P<0.001). However there were no significant correlations between throw distance and the release angle of the hammer head, or between throw distance and the release height of the hammer head. The velocity of the hammer head increased with the number of turns, and the maximum velocity of the hammer head at each turn showed a significant positive correlation with the throw distance. The radius of curvature of the hammer path was calculated from the velocity and acceleration of the hammer head. The hammer head showed greater tangential acceleration when the radius of curvature of the hammer path was reduced. Furthermore, the normal acceleration increased during the phase when the radius of curvature of the hammer path was reduced.

Journal

  • Taiikugaku kenkyu (Japan Journal of Physical Education, Health and Sport Sciences)

    Taiikugaku kenkyu (Japan Journal of Physical Education, Health and Sport Sciences) 51(4), 505-514, 2006

    Japanese Society of Physical Education, Health and Sport Sciences

Cited by:  1

Codes

  • NII Article ID (NAID)
    110004782812
  • NII NACSIS-CAT ID (NCID)
    AN00409623
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    0484-6710
  • NDL Article ID
    8064030
  • NDL Source Classification
    ZF21(教育--体育)
  • NDL Call No.
    Z7-293
  • Data Source
    CJPref  NDL  NII-ELS  J-STAGE 
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