Seventy subjects with shoulder impingement syndrome associated with scapular dyskinesis will be recruited and randomized into two groups of treatment. The group "a" will receive a strenghtening protocol with progressive overload during 20 sessions and group "b" will receive the same protocol with minimal load, without change during the 20 sessions. The primary outcomes measures will be pain, function, quality of life, global impression of recovery. The change will be measure from baseline at 10 weeks (after 20 sessions), 3 and 6 months (follow-up). The secundary outcomes will be disability, quality of life measure by other instruments, shoulder muscle strength and scapular 3d kinematic variables. For these data, change will be measure from baseline at 10 weeks (after 20 sessions).

Inclusion Criteria:

• People with diagnosis shoulder impingement syndrome or supraspinatus/rotator cuff tendinopathy or subacromial bursitis
• shoulder pain for more than 4 months, at least 4 points of pain in 0-10 NPRS
• at least 130° shoulder active elevation
• 3 or more positive of 5 physical examination tests (painful arc, external rotation resistence, Neer, empty can (Jobe) and Hawkins-Kennedy
• positive dynamic scapular dyskinesis in clinical observation

Exclusion Criteria:

• Referred pain from vertebral spine
• previous shoulder, elbow or neck surgery
• complete rotator cuff tear (positive drop arm sign or substantial shoulder elevation or rotation weakness)
• neoplastic or neurological disorders
• previous fracture or dislocation injury (shoulder, humerus, clavicle)
• adhesive capsulitis signs
• inflammatory diseases
• specific treatment for the shoulder in the previous four months (injection, physiotherapy)
• using drugs in the previous week
• inability to understand portuguese language