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バスケットボールの両手打ちシュート，空手の蹴上げ，バレーボールのスパイクおよびソフトテニスのサービスという四つの運動について熟練者と未熟練者の動作の違いを運動連鎖の視点で分析した。三次元動作解析装置を用いて計測した身体座標から，各部位の速度や関節運動の角速度を計算し，キネマティクスパターンを求めた。熟練者に共通したキネマティクスパターンは，最末端部，それが手，足，ラケットなら，その部位の速度が最大に到達する時刻近辺で，一つ近位の部位，つまり肘，膝，手の速度が急減して極小値を持つ点であった。一方，純粋な近位‐遠位運動連鎖パターンは熟練者においても，必ずしも認められなかった。

The purpose of this study is to develop a video motion analysis system and to analyze the human kinetic chain during tennis service movements. The video digitizer and frame buffer were used to transfer the video picture to the computer. Polynomial regression curves of velocity were calculated from coordinate data. Relationships between maximal，minimum and points of inflection of racket head velocity and maximum wrist joint velocity were examined to solve the differential equations from velocity curves. The results of this study show that in this investigation that the phenomenon of maximum acceleration of a racket head caused by the negative acceleration of the wrist joint was associated with human kinetic chain.

The purpose of this study is to develop a video motion analysis system and to analyze the human kinetic chain during tennis service movements. The video digitizer and frame buffer were used to transfer the video picture to the computer. Polynomial regression curves of velocity were calculated from coordinate data. Relationships between maximal，minimum and points of inflection of racket head velocity and maximum wrist joint velocity were examined to solve the differential equations from velocity curves. The results of this study show that in this investigation that the phenomenon of maximum acceleration of a racket head caused by the negative acceleration of the wrist joint was associated with human kinetic chain.