The aim of this study was to compare the delivery motions of baseball catchers and infielders. Thirteen catchers and 16 infielders participated in the study. 3D analysis was used to analyze the release parameters, the durations of 4 phases, and trunk, pelvis and throwing arm kinematics in the two groups. No statistical difference in ball velocity and angle of release was found between the groups. Of the 45 angular position and angular velocity parameters tested at key instants in the throws, 15 showed significant differences between the groups. The only significant differences in maximum angular velocities and in their times of occurrence were in the maximum pelvis forward rotation angular velocity and in the time of occurrence of the maximum elbow extension angular velocity. These results should be useful for the improvement of baseball throwing motions.
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