| Budget Amount *help |
¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2010: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2009: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
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| Research Abstract |
The purpose of the present study was to demonstrate the correlation between the force to a ball and joint motion of hip, trunk, shoulder and elbow in adolescent baseball players. The subjects were 15 adolescent baseball players (13.7±0.8 yrs) and 15 collegiate baseball players (22.1±1.5yrs). Throwing motion images were captured by three high-speed cameras, and a 3D analysis established by direct leaner translation method was performed to obtain the angles and the angular velocity of each joint, and the acceleration of wrist toward the target at ball release (Acc). In the adolescent players, significant linear correlations were found between Acc and trunk rotation angle(r=-0.59), elbow extension angle(r=-0.75), shoulder internal rotation velocity(r=-0.76) and elbow extension velocity (r=-0.61). In the collegiate players, significant linear correlations were found between Acc and hip adduction velocity (r=-0.51) and elbow extension velocity (r=-0.61). The finding indicates the adolescent players may depend on the upper extremity motion more than hip joint motion during throwing. Coaches and athletic trainers may need to focus on the hip joint motion in order to prevent throwing injuries from occurring in adolescent baseball players.
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