Eccentric exercises of the supraspinatus muscle were performed in 3 sets of 10 repetitions. Participants were asked to perform the exercise program on an individual basis twice every day for 4 weeks. The eccentric program consisted of 3 exercises, focusing on the supraspinatus, infraspinatus, and scapular muscles. Participants were asked to do a normal abduction (concentric phase) and a slow return to the initial position (eccentric phase) included first the concentric phase, and the eccentric phase was slowly conducted. The exercise program was taught by a physiotherapist in the first session and monitored in the subsequent sessions.