The investigators will test whether conscious control with manual guides and video or EMG biofeedback will enhance 3-D kinematics of scapula in shoulder dysfunction subjects with different type of scapula dyskinesis. The investigators will also examine how correction of scapular orientation may affect the activation of associated muscles during various dynamic movements in these subjects.
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Shoulder complex kinematics
Timeframe: The scapular kinematics will be measured before scapular control and immediately after scapular control
Shoulder associated muscular activities
Timeframe: The muscle activation will be measured before scapular control and immediately after scapular control