技術選スキー選手の大回り滑走動作に対する主観的評価と3次元解析による滑走動作パラメータとの関連性

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タイトル別名
  • Relations between Subjective Judgment and Objective Parameters by the Three Dimensional Motion Analysis of Long-radius Turns of the Demo Skiing
  • ギジュツセン スキー センシュ ノ オオマワリ カッソウ ドウサ ニ タイスル シュカンテキ ヒョウカ ト 3ジゲン カイセキ ニ ヨル カッソウ ドウサ パラメータ ト ノ カンレンセイ

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説明

The purpose of this study was to make clear the characteristics of superior ski technique by investigating the relationship between subjective evaluation of skiers’movements and objective parameters of 3-dimensional analysis. Seventeen Japanese skiers performed long radius turns and were filmed with two cameras（60Hz），panned and fixed. These runs were scored out of a maximum of 100 points by three referees. To obtain the 3D space coordinates, the Panning DLT method was adopted. Relationships between the score and the parameters obtained using 3D motion analysis were examined by using correlation analysis, and elements of an outstanding ski technique were investigated. There were significant correlations between the scores and the following:（1）radius of curvature at the turn maximum（r=－0.840, p<0.001），（2）the lean angle of the center of mass（CM）at the turn maximum（r=0.628, p<0.01），（3）the angle formed by CM velocity and the fall line at the point where the lean angle of CM was vertical to the slope（the onset of turning）（r=0.816, p<0.001）and（4）the lean angular velocity of CM at the onset of turning（r=0.546, p<0.05）．This study suggests three characteristics of outstanding ski technique: a sharp and wide turn made by gaining centripetal force, a large lean angle of the body, and a rapid edge changing.

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