Does adding heavy load eccentric training to rehabilitation of patients with unilateral subacromial impingement result in better outcome? A randomized, clinical trial

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61 patients were randomized to undergo either traditional rotator cuff training or eccentric exercises combined with traditional rotator cuff training for treating subacromial shoulder impingement. 12 week results, investigating effects of heavy load eccentric exercises on pain, strength and shoulder function, demonstrated a 15 % greater gain in isometric 90 degree abduction strength, but similar improvements in pain and function as traditional rotator cuff training alone.