Efficacy of strain counter strain technique on electromyographic amplitude in subjects with upper trapezius trigger points. Randomized clinical trials

INTERVENTION: active range of motion and instruction strain counter strain technique CONDITION: ; Musculoskeletal Diseases Musculoskeletal Diseases PRIMARY OUTCOME: muscle amplitude will be assessed by electromyographe. SECONDARY OUTCOME: neck function will be assessed by arabic neck disability index the pain will be assessed by visual analogue scale INCLUSION CRITERIA: 1‐Forty patients from both genders. 2‐Their age between 19 and 38 years 3‐ patients is required to have active TrPs in the upper trapezius muscle unilaterally