Abstract: Objective: The paper is to investigate the characteristics of elite male swimmers’ shoulder joint muscle strength. Methods: IsoMed 2000 isokinetic muscle strength test system(made in Germany)is used to conduct quantitative test of 46 elite male swimmers’ left, and right shoulder joints for their flexion and extension, adduction, outreach, and internal rotation, external rotation movement mode (slow motion mode ,60°/ S and fast ,240°/ S). Results:(1) the 60°/s muscle strength test indicates that the relative peak torques of adduction and internal rotation on both sides are significant difference (P＜0.05). The 240°/s muscle strength test shows that the relative peak torques of external rotation on both sides demonstrate significant difference (P＜0.01).(2) The peak torque of adduction/abduction at angular velocities 60°/s and 180°/s in shoulder joints exhibits significant difference between the left and right side (P＜0.05), and the peak torque of internal rotation/external rotation between left and right sides just follows suit (P＜0.05). (3) Shoulder joint flexor/extensor PTR is 0.50-0.60, adduction/abduction muscle PTR, 0.80-0.99, and the internal /external rotation PTR, 1.60-1.78. Conclusion: Many subjects` left shoulder adduction, internal rotation of absolute power, the explosive force, and shoulder extortor endurance should be strengthened, so it is recommended that attention should be paid to the exercise intensity in strength training to reduce the chances of injuries.

Key words: swimming, athlete, shoulder joint, isokinetic muscle testing