Abstract: Purpose:The aim of this paper studied the strength of muscle group around shoulder in the female volleyball players with Subacromial Impingement Syndrome(FVPSIS) and the male weightlifting players with Subacromial Impingement Syndrome(MWPSIS).Methods: Evaluated the dominant shoulder function of the female volleyball players and the male weightlifting players in Guangdong,then made a definite diagnosis that Group I were thirteen FVPSIS and Group II were eight female volleyball players with nomal shoulder, and Group III were nine MWPSIS and Group IV were ten male weightlifting players with nomal shoulder.Measured the dominant shoulder range of motion and the strengh muscle group around shoulder by a electronic tacheometer and a Hoggan MicroFet 2 handheld myodynamia tester respectively.Results: were compared the difference of the shoulder range of motion and the strength of muscle group around shoulder between two group players separately.Results: Compared with Group II, there were obviously restricted in shoulder flexion and abduction of Group I(P<0.05),declined clearly on the strength of upper trapezius (P<0.01)but rised on the strength of lower trapezius and serratus anterior muscle(P<0.05), changed no apparently on the strength of middle trapezius,fell on the strength of internal rotation and external rotation of rotator cuff at the frontal plane(P<0.05),the same to the scapula position(P<0.05)bur rised evidently on one hundred and twenty degree external rotation(P<0.01). Compared with Group IV, there were obviously restricted in the shoulder flexion,extention and abduction of Group III(P<0.05),particularly in the shoulder flexion very clearly(P<0.01);declined apparently on the strength of upper trapezius (P<0.05),the same to the strength of middle and low trapezius but not clearly, rised on the strength of serratus anterior muscle but not obviously;fell evidently on the strength of internal rotation and external rotation of rotator cuff at the frontal plane of 60° and 90°(P<0.05),especially at the 60° internal rotation and the 90° external rotation very apparently(P<0.01);drop clearly on the strength of internal rotation and external rotation of rotator cuff at the scapula plane of 60°,90° and 120°(P<0.05),especially very apparently external rotation at these three kinds of degree(P<0.01).Conclusion:Compared with players with nomal functional shoulder respectively,It was all decreased the strength of muscle group around shoulder in FVPSIS and MWPSIS, but the level of the decline and the compensation due to decline were analyzed targtedly according to different sports.

Key words: The Female Volleyball Players, The Male Weightlifting Players, The Strenghof Muscle Group Around Shoulder, Subacromial Impingeme