子供の投球フォーム

概要

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All previous studies of baseball throwing motion have been limited to elite mature adult pitchers like professional and collegiate athletes. On the other hand, the throwing motion of children might be poorer than the adults.Ten baseball athletes were analyzed by a 3D motion analysis system. These subjects were divided into two groups. One included athletes of fifteen years and under (IM), the other included athletes of twenty years and over (MA). Reflective markers were attached to 34 bony landmarks and the subject threw 10 fast balls. The reflections of these markers were tracked by seven CCD cameras at 500Hz. The subjects 3 fastest balls that passed through the strike zone were analyzed by Motion Capture System (Qualysis, Inc.). The data of each group was averaged to compare the throwing biomechanics between the two groups.Fleisig et al. suggested that throwing mechanics did not change significantly with developmental level. The shoulder abduction was lower in the IM group than the MA group. So children threw with positioning their elbows lower. They kept the centers of gravity lower and more backward. Also their trunks were less twisted.
日本肩関節学会の論文