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投球速度の高い野球投手における四肢、体幹筋の形態的特性 Morphological characteristics of limbs and trunk muscles in baseball pitches with high ball speed 長谷川, 伸 ハセガワ, シン HASEGAWA, Shin muscle thickness baseball pitchers ball speed The purpose of this study was to investigate the characteristics of the muscle morphology of limbs and trunk in baseball pitchers with high ball speed. The high ball speed group (average ball speed is over 140 km/h : n=7) and the low ball speed group (average ball speed less than 130 km/h : n=9) were compared for muscle mass and muscle thickness. Muscle thickness was measured bilaterally with B-mode ultrasonography. In the lean body mass and muscle mass (whole body, upper limbs, lower limbs and trunk), the high ball speed group showed a significantly higher value than the low ball speed group. In comparing the muscle thickness of muscle groups, the high ball speed group showed significantly greater muscle thickness at 5 sites (forearm, lumbar superficial, buttocks, back of thigh, posterior lower leg) on the throwing side than the low ball speed group. On the other hand, the high ball speed group showed significantly greater muscle thickness at 6 sites (anterior abdomen, lateral abdomen, lumbar superficial, buttocks, back of thigh, posterior lower leg) on the nonthrowing side than the low ball speed group． In the comparison of the muscle thickness of individual muscles, the high ball speed group showed significantly greater muscle thickness in 3 muscles (spinal erector, gluteus maximus, gastrocnemius) on the throwing side than the low ball speed group. Also, the high ball speed group showed significantly greater muscle thickness in 7 muscles (pectoralis minor, rectus abdominis, abdominal internal oblique, transversus abdominal, erector spinae, gluteus maximus, biceps femoris) on the non-throwing side than the low ball speed group. These results indicate that baseball pitchers with high ball speed have a greater muscle thickness in trunk rotators and leg extensors. 九州共立大学 2018-09-28 jpn departmental bulletin paper https://doi.org/10.15093/0000000360 https://kyukyo.repo.nii.ac.jp/records/360 10.15093/0000000360 40021712467 AA12533413 2186-0483 九州共立大学研究紀要 Study journal of Kyushu Kyoritsu University 9 1 49 56 https://kyukyo.repo.nii.ac.jp/record/360/files/kiyo9-1-6.pdf application/pdf 1.3 MB 2019-01-09