In this study, the first purpose was to examine whether the improvement of recognition improved throwing movement. Another purpose, was to examine the impact of watching self-movement to gain self-improvement.
Subjects included 18 university students aged 20.8±0.5 years. Subjects were asked to sit down on a chair and throw a tennis ball using their non-dominant arm as a pretest. Afterwards they answered a questionnaire in relation to how they felt about their own movement while throwing. Then, the subjects were randomly assigned to two groups, named the video group and the control group. The video group was instructed on four points of throwing movement while watching a video of their own movement and the control group was only given verbal instruction. The four points of movement based on the time when the maximum horizontal abduction is obtained within the shoulder joint during throwing were the ① height of the elbow, ② openness of the chest, ③ twist of the body, ④kinetic chain. After instruction, the subjects threw a tennis ball and answered a questionnaire again as posttest. Their movements were analyzed using a three-dimensional movement analysis system (Venus 3D, Tokyo).
As to the results, the subjects who improved their recognition of what is needed to have good throwing technique, as measured by the questionnaire, for ① height of elbow ② openness of the chest and ③ twist of the body, improved their movement significantly in the posttest. Moreover, the number of subjects who were able to recognize the movement points increased in the video group. In the present study, the throwing movement improved when the subjects improved recognition of their own movement. Therefore, by seeing one’s own movement in a video, the possibility of improving throwing technique was recognized.
