Abstract
Variation of motion during baseball pitches with constant effort to be constant speed and control was examined with inertial sensors and strain gauges. The measuring items were the angular velocities about two axes of thighs and leg, the angular velocities of rotation of torso and hip, and forward tilting of torso, the angular velocities of internal/external rotation of shoulder and pronation/supination of forearm, the angular velocities of swing at upper arm and forearm, and strains of nails of 2nd finger and 3rd finger. The variations of the angular velocities during constant baseball pitches were relatively larger at leg and thighs and were smaller at upper limb and shoulder.
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