Change in the Overarm Throwing Technique Due to Practice in Japanese Elementary School Girls

The purpose of this study was to investigate the change in performance and technique of the overarm throwing in elementary school girls through a practice using the standard motion model. Fifteen girls from sixth grade were participated in three sessions: videotaping sessions at the preand post-practice and practice session. The throwing motions were videotaped with two high-speed cameras and analysed three-dimensionally. Through the practice using the standard motion model as a reference, throwing distance and ball velocity significantly improved. The trunk forward rotation became similar to that of standard motion model and the mechanical work in the throwing arm increased after the practice. The results indicated that the use of standard motion model was useful to improve the throwing motion as well as throwing performance in elementary school girls.