| Budget Amount *help |
¥14,430,000 (Direct Cost: ¥11,100,000、Indirect Cost: ¥3,330,000)
Fiscal Year 2021: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Fiscal Year 2020: ¥2,210,000 (Direct Cost: ¥1,700,000、Indirect Cost: ¥510,000)
Fiscal Year 2019: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
Fiscal Year 2018: ¥6,500,000 (Direct Cost: ¥5,000,000、Indirect Cost: ¥1,500,000)
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| Outline of Final Research Achievements |
Previous studies on throwing injuries have yielded conflicting results as to whether a certain breaking ball is a risk factor for the throwing injury. In this study, three phalanx segments and a ball were added to the conventional simplified rigid body model of the upper extremity. Thus, a totally seven-segment rigid body model was used to estimate the kinetics during baseball pitching of various types of pitch. In addition, a musculoskeletal model was also used to estimate the selected muscles’ moments and tendons’ sprains and compare them between fastballs and the breaking balls. The selected muscles were elbow flexion muscles. The developed seven-segment model showed that the conventional model underestimated joint kinetics, especially in the case of the slider. For the musculoskeletal model, As a result, any differences were not found in the selected muscle moments or tendon sprains. No results were obtained to positively indicate that the breaking balls are a risk factor.
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