A change in scapula position or motion may cause an internal rotation of the humerus resulting in a shortened internal rotator muscle (subscapularis) and a stretched or weakened external rotator muscle (teres minor). (postureanalysis.com)
If you have a shoulder problem, take 6 months off of doing shoulder internal rotators and started doing shoulder external rotation. (schaffermethod.com)
Therefore, it appears that the latissimus dorsi functions as a glenohumeral internal rotator and displays its greatest contribution from -20 degrees of external rotation to 60 degrees of internal rotation. (strengthandconditioningresearch.com)