The efficacy of eccentric exercise in the treatment of Achilles tendinopathy: a systematic review and meta-analysis.

Achilles tendinopathy, a degenerative condition affecting the tendon, is commonly treated with eccentric exercise, a specific type of muscle-lengthening exercise, but how it truly compares to other conservative treatments has remained unclear. This review pooled 21 randomized controlled trials involving nearly a thousand participants, comparing eccentric exercise against physical therapies, other exercise programs, and injection-based treatments, looking at pain, function, and tendon structure seen on ultrasound. Eccentric exercise reduced pain more than physical modalities like ultrasound or laser therapy, and ultrasound imaging showed improvements in tendon thickness and reduced blood vessel growth, suggesting some structural change. However, when compared against other forms of exercise therapy, its pain relief was similar rather than superior, and functional improvement results varied so much between studies that no firm conclusion could be drawn there.

The main limitation is this high variability across trials, meaning eccentric exercise appears to be a reasonable option within loading-based programs but not a clearly superior, standalone gold standard treatment.

If you have Achilles tendinopathy, a condition where the tendon at the back of your ankle becomes painful and degenerates, you may have heard eccentric exercise, a specific type of muscle-lengthening exercise, recommended as a treatment. This review looked at 21 studies with nearly a thousand participants to see how it stacks up against other treatments like ultrasound therapy, other exercise programs, and injections. The findings suggest eccentric exercise reduced pain more than passive physical treatments such as ultrasound or laser therapy, and ultrasound scans showed some improvement in tendon structure, including thickness and reduced blood vessel growth.

However, when compared to other exercise-based programs, eccentric exercise did not show clearly better pain relief, just similar results. Its effect on function was harder to interpret because results varied a great deal from study to study.

The main takeaway is that eccentric exercise looks like a solid option among exercise-based approaches for this condition, but the evidence does not show it stands out as unquestionably better than other forms of exercise therapy.

This is a summary of research, not medical advice. Talk to your own healthcare provider about anything affecting your care.

This meta-analysis addresses a recurring clinical question in Achilles tendinopathy management: whether eccentric exercise offers a distinct advantage over other conservative options, or whether its benefit is simply a function of loading in general. Pooling 21 randomized controlled trials totaling 994 participants, the authors found eccentric exercise produced statistically significant pain reductions compared with physical modalities (VAS standardized mean difference -0.54; NRS standardized mean difference -0.29), alongside ultrasonographic improvements in anteroposterior tendon thickness (standardized mean difference 0.41) and reduced vascularity, supporting a structural remodeling effect. However, when compared against other exercise therapies, pain outcomes were comparable rather than superior, indicating that mechanical loading intensity, rather than the eccentric contraction type specifically, may be the key therapeutic driver.

Functional outcomes measured by VISA-A showed smaller improvements in the eccentric group relative to controls, but extremely high heterogeneity (I squared 86.1%) precluded any definitive interpretation of this finding. The main limitation for practice is this heterogeneity, likely reflecting inconsistent protocols and unaccounted-for tendinopathy subtypes across trials, which limits confidence in translating pooled functional results into specific dosing or progression guidance. The findings support eccentric exercise as one reasonable option within load-based programs rather than an independently superior treatment.