Comparing Low-Load Blood Flow Restriction Training and High-Load Training for Chronic Achilles Tendinopathy in Adults Aged 18 to 50

What this Trial Is About

This research aims to evaluate the clinical effects of low load training with blood flow restriction BFR-LLT compared to high load training HLT in adults aged 18 to 50 years with chronic midportion Achilles tendinopathy MAT. MAT is a common overuse injury causing pain, limited function, and disruption of sports activities. While high load training is effective, it can be difficult for some people to tolerate. BFR-LLT may offer a lower intensity alternative, but its effects on tendon pathology have not yet been studied. Participants will be randomly assigned to one of two groups the BFR-LLT group will use a pneumatic tourniquet system on the thigh while performing two calf-raise exercises at 20% of their one-repetition maximum 1RM, with progressive load increases every four weeks. The HLT group will perform the same exercises at 70% 1RM, also with progressive increases. Both groups will train three times a week for 12 weeks, completing sets and repetitions tailored to their assigned training load, with rest periods between sets and exercises. Throughout the study, participants will undergo evaluations at baseline, 6 weeks, and 12 weeks to measure changes in pain intensity and function using the VISA-A questionnaire. Additional assessments at baseline and 12 weeks will include tendon thickness, cross-sectional area, neovascularization, single-leg vertical jump, and calf-raise endurance. All assessments will be conducted by a blinded physiotherapist. The total study participation will last 12 weeks with ongoing monitoring of tendon health and function.

Effects of Low-load Resistance Training With Blood Flow Restriction in Patients With Achilles Tendinopathy