부산대학교 도서관

Purpose: Baseball pitching is an asymmetric movement. Long-term pitching training may gradually lead to an imbalance in the body because of overuse. Therefore, this study implemented a functional movement screen (FMS) to evaluate bilateral asymmetry, mobility, and stability. Focuses on the movements which had a lower score in FMS, giving intervention to improve their ability to control human behaviors and increase their athletic performance in the study. Methods: The participant is a 26-year-old pitcher pitching in Minor League Baseball who has been playing baseball for 16 years and pitching for 15 years with 198 height and 100 kg weight. The highest level is triple-A in his pitching career. The subject's movement qualities were evaluated by the functional movement screen (FMS) including seven types of motions, and then give interventions with a training program. Additionally, using a 3D motion system and force plates analyze the change of pitching motion and ball velocity before and after the training program. Results: The ball velocity increased +5.8%, the stride period is shorter -1.2%, the arm cocking period is shorter -15.7%, the arm acceleration period is longer +17.4%, the distance of striding is shorter -3.0%. Compare the pre-test and post-test, in stride foot contact, Max ER, and release periods the rotational angle of the pelvis decreased 8.67%, 5.25%, and 7.99% respectively, extensional angle of the pelvis in stride foot decreased 4.05%, 2.23%, and 5.34% respectively, the flexible angle in stride foot decreased 0.01%, 3.92%, and 4.44% respectively. The peak force of GRFs in the pivot foot decreased 2.4% in the pitching direction and 4.4% in the vertical direction. The peak force of GRFs increased 6.2% in the pitching direction and 2.6% in the vertical direction during the arm cocking period. Moreover, the peak force of GRFs increased 7.9% in the pitching direction and 3.7% in the vertical direction during the arm acceleration period. Conclusion: After the intervention, the pitcher's ball velocity and movement have changed without additional technical guidance, indicating that his body control ability had been improved and that the kinetic chain was smoother than before.