A Comparative Analysis of Post-Isometric Relaxation and Ultrasound Therapy on Pain and Function in Athletes with Achilles Tendinopathy

Background and Purpose: Achilles tendinopathy is a prevalent condition affecting both athletes and non-athletes, characterized by tendon degeneration due to repetitive overuse. This study aims to compare the effectiveness of post-isometric relaxation (PIR) and ultrasound therapy in managing Achilles tendinopathy in athletes, focusing on pain reduction, muscle strength, and functional improvement. Methodology and Procedure: A comparative study was conducted with 30 athletes suffering from Achilles tendinopathy, randomly divided into two groups: Group A (PIR) and Group B (ultrasound therapy). Both groups received the same foot exercises, with Group A undergoing PIR and Group B receiving ultrasound therapy for one month. The effectiveness of the treatments was evaluated using the Chronic Pain Grading Scale, Manual Muscle Testing, and the Victoria Institute of Sports Assessment-A (VISA-A). Results: The study found a significant reduction in chronic pain (p = 1.8 × 10⁻⁵) and a marked improvement in muscle strength (p = 0.046) and ankle function (p = 9.08 × 10⁻⁸) in the PIR group. However, ultrasound therapy showed limited impact on muscle strength and functional improvement, with no significant differences observed in these outcomes. Conclusion: Post-isometric relaxation (PIR) proved to be more effective than ultrasound therapy in improving pain, muscle strength, and functional outcomes for athletes with Achilles tendinopathy. The findings suggest PIR as a preferred treatment modality for managing Achilles tendinopathy in athletes.