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Relationship between bending of pole and motion of both grips in pole vault

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Other Title
  • 棒高跳におけるポールの曲がりと両グリップの動きとの関係
  • ボウタカトビ ニ オケル ポール ノ マガリ ト リョウ グリップ ノ ウゴキ ト ノ カンケイ

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Abstract

The purpose of this study was to analyze the relationship between the bending of the pole and the motion of both grips in the pole vault. Eight male vaulters, ranging in skill from the top international level to intercollegiate entry level (personal best record, 4m60―5m77), participated. The three-dimensional coordinates of reflective markers attached to their body were collected by a motion capture system (250 Hz), where the X-, Y-, and Z-axes was set to leftward, opposite to the progress of the run-up, and upward directions, respectively. The results are summarized as follows:<br>  (1) The larger the change in velocity of the vaulterʼ s center of gravity for the Y direction from take-off (TO) to maximal pole bend (MPB) became, the higher the rate of maximal pole-bend became (r = 0.88).<br>  (2) The smaller the displacement of the upper grip in the upward vertical direction from TO to MPB became, the higher the rate of maximal pole-bend became (r = -0.83).<br>  (3) The larger the angular displacement in a negative direction in the segment connecting both grips within the Y-Z plane from TO to MPB became, the higher the rate of maximal pole-bend became (r = -0.70).<br>  These results suggest that in pole vaulting the motions of both grips, i.e. the displacement of the upper grip in an upward vertical direction being smaller from TO to MPB and the lower grip being temporarily higher than the upper grip during the same phase, lead to the follow-through motion of the vaulter after TO, and are related to the bending of the pole, which in turn affects the performance.

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