三次元動作解析による超一流大学野球投手のピッチングに関する事例的研究

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Using three-dimensional analysis by the DLT method, a biomechanical study of fastball pitching was performed on four college baseball pitchers including a national top-class pitcher (UH). All pitchers were right-handed, and the fastball velocity and their pitching form were analyzed using two high-speed video cameras. The highest fastball velocity by UH was 147.0 km/hr, followed by 137.3 by NG, 134.2 by HS and 129.2 km/hr by MT. In pitching by UH the acceleration period after the left foot landed on the ground appeared earlier and lasted longer than those of the other pitchers. There were no individual differences found in the forward shoulder velocity, but differences were found in the velocity of the throwing arm segments in the sagittal plane. The reason for the high ball velocity achieved by UH was attributed in part to a combination of high forward velocities in the upper arm swing and the palmar flexion of the wrist (so-called snapping). Based on a bird's eye view analysis, the amount of tor-so-twisting due to angular phase-shift between the shoulder and hip rotations was smaller in UH and NG who showed a higher ball velocity, while HS and MT with slower ball velocity showed greater tor-so-twisting. In the frontal plane, the left shank of UH maintained an inward inclination, whereas the other pitchers rotated the shank outward from an upright position. Such a continued inward inclination of the shank in UH might contribute to his powerful torso-rotation and well-controlled fastball pitchine.
大阪体育大学の論文
2002-07-01

三次元動作解析による超一流大学野球投手のピッチングに関する事例的研究

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