著者
長谷川 伸
出版者
九州共立大学
雑誌
九州共立大学研究紀要 = Study journal of Kyushu Kyoritsu University (ISSN:21860483)
巻号頁・発行日
vol.9, no.1, pp.49-56, 2018-09-28

The purpose of this study was to investigate the characteristics of the muscle morphology of limbsand trunk in baseball pitchers with high ball speed. The high ball speed group (average ball speed isover 140 km/h : n=7) and the low ball speed group (average ball speed less than 130 km/h : n=9) werecompared for muscle mass and muscle thickness. Muscle thickness was measured bilaterally with B-modeultrasonography. In the lean body mass and muscle mass (whole body, upper limbs, lower limbs andtrunk), the high ball speed group showed a significantly higher value than the low ball speed group. Incomparing the muscle thickness of muscle groups, the high ball speed group showed significantly greatermuscle thickness at 5 sites (forearm, lumbar superficial, buttocks, back of thigh, posterior lower leg) onthe throwing side than the low ball speed group. On the other hand, the high ball speed group showedsignificantly 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 showedsignificantly greater muscle thickness in 3 muscles (spinal erector, gluteus maximus, gastrocnemius) onthe throwing side than the low ball speed group. Also, the high ball speed group showed significantlygreater muscle thickness in 7 muscles (pectoralis minor, rectus abdominis, abdominal internal oblique,transversus abdominal, erector spinae, gluteus maximus, biceps femoris) on the non-throwing sidethan the low ball speed group. These results indicate that baseball pitchers with high ball speed have agreater muscle thickness in trunk rotators and leg extensors.

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前脚接地前から軸足内転筋で前脚に引き寄せ、ゼロポジション時には両脚内転筋が作用。リリースに向かうにつれて、前脚内転筋かつ、非投球側腹筋群が作用します。 さらに理解を深めたい方は、以下の論文を読むといいと思います。 https://t.co/EQJ0WyT7hr https://t.co/weTUUogj2R https://t.co/tTZQh5kSkp

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