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[Purpose] We analyzed the change in rotational angular velocity of the shoulder girdle and pelvic girdle induced by repetitive pitching. [Subjects] Eight collegiate baseball team players participated in this research. [Methods] Rotational angular velocity of the shoulder girdle and pelvic girdle during 60 pitches were recorded by a high-speed camera in the horizontal plane. We compared the rotation angle and rotational angular velocity of the shoulder and pelvic girdles between the first and last 10 pitches in the acceleration phase. [Results] In the group that maintained or increased their ball speeds the relative shoulder girdle rotational angular velocity did not change. [Conclusion] Thrower may unconsciously diminish the change of relative shoulder girdle rotation angular velocity to maintain ball speed in a fatigued condition.

Analysis of Throwing Form Induced by Repetitive Pitching