Evaluation of Muscle Strength in University Baseball Players.

概要

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Isokinetic strength of the muscles moving the shoulder was evaluated in 47 university baseball players and 33 non-baseball players. Baseball players were classified depending on the position and presence of any shoulder impingement signs. The CYBEX 350 isokinetic machine was used to evaluate the strength of the shoulder muscles at 60 degree/second. Muscle strength was evaluated using three parameters (peak torque, muscle strength ratio and peak torque angle). Baseball players hadahigher peak torque at horizontal shoulder abduction than non-baseball players at 0° flexion averaged 7.1° in pitchers, -9.0° in infielders and -14.8° in non-baseball players. Thirteen players with positive impingement signs had a higher strength ratio of shoulder external and internal rotation in the shoulder at 90° of flexion than 34 players without any impingement signs (p<0.05). The peak torque angle of baseball players showed more flexion, extension, abduction, and less external rotation in 90° of shoulder flexion, compared to without any signs of impingement. These results suggest that muscle strength is related to torque and angle, making necessary when studying muscle strength to not only study peak torque and muscle strength ration but also to study torque angle.
西日本整形・災害外科学会の論文