新体操のフェッテピボットにおける踏み込み動作のバイオメカニクス的特徴

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  • Biomechanical characteristics of movements of the support leg during fouette en tournant in rhythmic gymnastics
  • シンタイソウ ノ フェッテピボット ニ オケル フミコミ ドウサ ノ バイオメカニクステキ トクチョウ

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The purpose of this study was to identify the kinetic characteristics of movements of the support leg during fouette en tournant in rhythmic gymnastics. Each skilled and unskilled female gymnast performed the fouette en tournant with the 2 sequential turns on the laboratory floor; 2 synchronized high-speed video cameras (300 fps) were used to record their performance using the direct linear transformation (DLT) technique. The ground reaction forces (GRFs) of the support leg (left leg) were determined using a force platform (500 Hz).The GRFs and three-dimensional coordinates of the segment endpoints (25 points) were determined to calculate the kinetic and kinematic variables. Although the rotational velocity of a skilled gymnast increased after extension of the support leg (plie), that of an unskilled gymnast decreased. The vertical GRF produced by extension of the support leg was lesser for an unskilled gymnast (2.56 N/bw) than for a skilled gymnast (3.22 N/bw). Moreover, the support leg of an unskilled gymnast did not show adequate extension at the knee joint.Thus,the greater vertical GRF obtained by a larger knee extension of the support leg during the plie is an important factor for maintaining a greater rotational velocity during the fouette en tournant in rhythmic gymnastics.

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