Aim: To compare the effect of isometrics, isotonic concentric and isotonic eccentric strengthening techniques on patients diagnosed with subacromial impingement syndrome.

Methods: The study design used is randomized clinical trial. 36 patients are allocated in 3 groups with 12 patients in each group with age limit from 30-50 years treated for 6 weeks on alternate days with isometrics, isotonic concentric and isotonic eccentric with baseline exercise plan respectively. Each patient received 18 sessions of exercise plan. Intervention plan is divided into 2 phases, with each phase of 3 weeks. Outcome measuring tools used are Numeric Pain Rating Scale(NPRS) to measure pain, Manual Muscle Testing (MMT) to measure muscle strength was assessed at Day 0, Week3, and Week 6.

Result: Results are generated by using SPSS 21. Post treatment ONE WAY ANOVA showed no significant difference in reduction of pain assessed by NPRS  in GROUP1 treated with isometric exercise plan and GROUP2 & GROUP3 treated with isotonic eccentric and isotonic concentric exercise plan respectively. Post treatment One way anova showed p value .117 which is greater than 0.05. Post treatment ONE WAY ANOVA showed significant difference for strength of all the rotator cuff muscles.

Conclusion: Isometric exercise plan conclusively proved to be better as compared to isotonic eccentric and isotonic concentric program in strengthening of patients with subacromial impingement syndrome.

Keywords: Subacromial Impingement Syndrome, Isometric, Isotonic Eccentric, Isotonic Concentric.