柔道受身動作の観察による頭部外傷リスク評価と頭頚部キネマティクスとの関連

抄録

The present study aims to investigate the relationship between observational and kinematic evaluation of the head injury risk during the breakfall motion for osoto-gari. Forty-seven participants (26 experienced judoka with black belt and 21 beginners) volunteered to participate in the study. We first developed three-dimensional animated movies of the breakfall motion and instructed the participants to evaluate the head injury risk of the motion using a 10-point Likert scale. The peak head extension momentum was also calculated from the biomechanical model. Pearson’s product coefficients were used to elucidate the relationships between the subjective score and the biomechanical parameters in the each group. The present study demonstrated that the observational evaluation of head injury risk in breakfall was significantly correlated to the peak head-neck extension momentum in the group of experienced judoka (r = - 0.39, P =0.048), but not in the group of beginners (r = 0.04, P = 0.57). The current result suggests that the even experienced judo practitioners may not be sufficiently developed to recognize the risk of head injury by observing the breakfall motion; therefore, regardless of judo experience, teachers may need to be educated about head injury prevention to teach judo safely in a school setting.