抄録
The purpose of this study was to investigate kinematic changes in baseball pitching during a simulated baseball game. Six collegiate baseball players threw 15 hastball pitches per inning for 9 innings in an indoor laboratory with a 5-minute inning interval and 5-second pitching interval. Whole-body kinematic data were collected by a motion capture system and ball sped was measured with a speed gun. Pitch strength and Grip strength were also measured during each inning interval. No significant difference was found in the ball speed over the 9 innings, where the trunk was leaned forward in the later innings. The subjects demonstrated decreased pinch strength in the later innings althoug no such decrease was found in the grip strength. These results suggest that consective pitches would mainly affect pinch strength, which may not be a major determinant of ball speed.
