| Summary: | 碩士 === 臺北巿立體育學院 === 運動器材研究所 === 96 === Good balance performance is important for baseball pitchers in order to achieve an ideal balanced position. The primary aims of this study are to: (a) compared the balance data (one leg stance test, eyes-close and center of pressure displacement), the baseball pitchers’ pitching performance (ball velocity and accuracy), kinematics (stride length, lead knee flexion, foot placement, center of mass displacement, pivot knee joint displacement, pivot ankle joint displacement and temporal data) between a normal situation and using an unbalanced base to interfere with the pitching motion. (b) Investigate the correlation between balance performance and pitchers’ performance, the correlation between pitchers’ performance and kinematics. Twelve healthy male right hand dominant baseball pitchers, from the Taipei Physical Education College baseball team, participated in this study. Ten motion capturing high-speed digitizing cameras, (Motion Analysis Corporation., Santa Rosa, CA) were used to record the three dimension throwing kinematic patterns of pitching. AMTI force plate were use to collected center of pressure data at the same time. Ball velocity was measured when the ball contacted the target net. Using a STALKER sports radar gun. A digital camera (Sony, DCR-TRV40, Japan) was used to record ball contact on the target net. siliconCOACH Pro video analysis software was employed to calculate the distance between ball location and target center. A self-made unbalanced base was used to disrupt pitching movement. COP displacement of wind-up phase, accuracy, stride length, COM displacement of stride phase and time percentage of arm-acceleration phase significantly affected the unbalanced base situation. Finally, there is no significant correlation relationship found in this study. The unbalanced base affected the part of baseball pitchers’ balance performance, pitching performance and kinematics, thus, in order to improve baseball pitcher performance, baseball pitchers could notes these parameters and it will help coaches and players to adjust specific conditions.
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