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A bnormalities related to the shoulder joint include various types of tendinitis, impingement syndromes, recurrent subluxations and dislocations, and degenerative joint disease. The etiology of the majority of these p a t h o b gies may be linked to disturbances caused from or resulting in abnormal joint kinematics. Of particular importance is the kinematic relationship between the scapula and the humerus, commonly referred to as the scapulohumeral rhythm. First discussed over 100 years ago by Cathcart (4), the scapulohumeral rhythm has continued to be frequently discussed and debated. It is generally accepted that a properly synchronized scapulohumeral rhythm is necessary for normal shoulder function. Because of the high dependence on active muscular forces for both scapulothoracic and glenohumeral joint stability and the fine control required to maintain the proper coupling or rhythm between the two, a reduction in forcegenerating potential may translate to a reduction in control or stabiliiration for certain types of joint motion. Following this premise, since fatigue is a process that affects the force-generating capacity of a muscle, one a p proach to studying the relationship

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