2019 Volume 4 Issue 2 Pages 155-161
The aim of this study was to determine to determine the effect of stretching external rotator muscles of the glenohumeral joint (GHJ) on the internal range of motion of the GHJ and force produced by the external rotator muscles of the GHJ in the individuals with posterior laxity affected external rotator strength. Twenty healthy young subjects were classified into a stable group (n=10) with no posterior shoulder laxity and a laxity group (n=10) with posterior shoulder laxity. Shoulder external rotator strength was measured three times chronologically - before and after external rotation with resistance and after a sleeper stretch. Each amount of muscle strength was normalized by the amount of strength measured at the baseline (100%). As a result, the stable group demonstrated the amount of strength for 93±10 after load and 105±13 after the stretching intervention, whereas the laxity group demonstrated 92±10 after exercise load and 95±10 after the stretching intervention. Moreover, muscle strength in the stable group increased significantly after stretching compared to after exercise load. These results suggested that stretching of the external rotators by individuals with posterior shoulder laxity could be associated with the risk of decreased muscle strength.
