筋力 • 筋持久力からみた投球動作における肩動的安定化機構の特性

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The aim of this study was to identify the features of isokinetic shoulder and hip muscle strength of throwing athletes. 20 competitive high school baseball players were studied. All of them had no history of shoulder pain. The tests were conducted using a Biodex system three multi-joint dynamometer. The shoulders were tested for their internal (IR) and external (ER) rotator muscle strength on the scapula plane and hips were tested for their internal (IR) and external (ER) rotator muscle strength. We examined the data of concentric isokinetic strength at low and high angular velocities. In addition, we examined the data of concentric isokinetic endurance strength at a high angular velocity. Shoulder and hip muscle strength at high angular velocity were found to be significantly-low compared with at low angular velocity. Especially, shoulder ER strengths were found to be significantly-low compared with IR strengths at high angular velocity and ER / IR ratios were found to be significantly-low at high angular velocity. In addition, shoulder ER endurance strength was found to be significantly-low compared with IR and shoulder ER / IR ratios decreased with muscle fatigue. Imbalance of internal and external rotational strengths of the shoulder was one of the important factors of throwing shoulder injuries. From this study, shoulders were originally difficult to keep the balance of internal and external rotational strengths at high angular velocity and with fatigue. The improvements of endurance strength and to limit the number of pitches are considered to be necessary to prevent throwing shoulder injuries.
日本肩関節学会の論文

筋力 • 筋持久力からみた投球動作における肩動的安定化機構の特性

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