The teres major and pectoralis major are adductors and may play a compensatory role for deficit in rotator cuff function. The investigators aim to (1) determine the effects of neuromuscular electrical stimulation (NMES) on the two adductors for the outcomes in symptomatic rotator cuff tear subjects, and (2) evaluate the immediate effect of NMES on the co-contraction of the adductors.Thirty symptomatic rotator cuff tear subjects will have NMES on the two adductors. The investigators will measure the acromiohumeral distance by ultrasonography and scapular kinematics during arm elevation with a three-dimensional motion tracking system. Co-contractions will be calculated by surface electromyography.
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acromiohumeral distance
Timeframe: change from baseline to "during the neuromuscular electrical stimulation"
scapular kinematics
Timeframe: change from baseline to "immediately after the neuromuscular electrical stimulation"