Comparison of two exercise protocols for insertional Achilles tedinopathy rehabilitation

INTERVENTION: Eccentric exercise and Isometric exercise plus concentric exercise CONDITION: Achilles tendinopathy ; ; PRIMARY OUTCOME: Pain during calf‐raise test SECONDARY OUTCOME: ‐ Tendon Structure determined by the ultrasound tissue characterization (UTC) ; ; ‐ VISA‐A questionnaire ; ; ‐ SF‐ 36 questionnaire ; ; ‐ Impact on work [Quality ‐ Quantity questionnaire (QQ‐q) and Work ability index (WAI)] ; ; ‐ Pain score ; ; ‐ Patients impression of improvement ; INCLUSION CRITERIA: ‐ Individuals of both sexes, aged between 18 and 55 years ‐ Chronic pain in the Achilles tendon insertion for more than 3 months ‐ Pain during the palpation ‐ Abnormal ultrasound imaging (hypoechoic areas, irregular fiber orientation and thickening of the tendon).