男子やり投げにおける投てき動作の評価基準

抄録

The purpose of this study was to develop the evaluation standards for the throwing motion of male javelin throwers and to confirm the usability of these evaluation standards. The throwing motion of 91 male javelin throwers (from novices to the world champion) was analyzed by using three-dimensional motion analysis methods focusing on the preparation phase (from the final right leg contact (R-on) to the left leg contact (L-on)). The results of the multiple linear regression analysis that considered the throwing record to be a dependent variable and the throwing motion parameters to be the independent variables revealed that approximately 76% of the throwing record was determined by seven throwing motion parameters. These parameters were as follows: 1) the body center of gravity (CG) velocity, 2) horizontal length from CG to grip, 3) trunk angle (sagittal plane) at L-on, 4) left knee angle at L-on, 5) arm angle (angle between right shoulder-grip line and x axis) at R-on, 6) right knee angle at R-on, and 7) hip angular displacement (angle between right hip- left hip line and x axis) during the preparation phase. The evaluation standards for the throwing motion were determined by considering the average values, standard deviation, and standardized partial regression coefficient of the abovementioned seven motion parameters. These evaluation standards were able to evaluate a response to the longitudinal change in the throwing motion of a javelin thrower who went from being a high school top level to being the national top level.