Shoulder joint velocity during fastball pitching in baseball
Xavier Gasparutto (TU Delft - Mechanical Engineering)
E van der Graaff (Vrije Universiteit Amsterdam)
Frans van der Helm (TU Delft - Mechanical Engineering)
DirkJan Veeger (TU Delft - Mechanical Engineering, TU Delft - Mechanical Engineering, Vrije Universiteit Amsterdam)
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Abstract
The purpose of this study was to assess the rotation and translation velocity of the shoulder complex during fastball pitching in baseball. 8 pitchers from the Dutch AAA team performed each 3 fastball pitches. Their motion was recorded by an opto-electronic device. Kinematic computation was performed using the quaternion algebra. The results showed that the endo-rotation, depression and backward rotation velocity of the humerus at ball release are initiated by a translation of the scapular girdle in the forward and upward direction before ball release.