Title : The Effects of a Posture Shirt on Throwing Velocity , Throwing Accuracy and Blood Flow in Professional Baseball Pitchers : A Pilot Study

Soft tissue impingement of the shoulder occurs in two critical areas; the subacromial space and coracohumeral space, areas often associated with shoulder dysfunction, pain and injury. Impingement has been described in several different anatomic locations and can be affected by gleno-humeral positioning. Sub-acromial and sub-coracoid impingement have been described as possible sources of pain and dysfuntion in overhead athletes or as a result of repetitive motion stress and postural dysfunction. A postural enhancing device (PED) may alter glenohumeral positioning subsequently having an effect on impingement patterns. The purpose of this study was to determine the effect of a PED on the sub-acromial and coracohumeral space in healthy subjects during shoulder abduction and adduction.