Reading

Influence of Resistance Training Proximity-to-Failure on Skeletal Muscle Hypertrophy: A Systematic Review with Meta-analysis

Refalo et al.

A systematic review with meta-analysis of 15 studies on how resistance training proximity-to-failure affects muscle hypertrophy in healthy adults. It finds only a trivial advantage for training to set failure over stopping short, no clear benefit from momentary failure, and evidence for a non-linear relationship between how close a set goes to failure and growth.

Key takeaways

Across 15 studies, training to set failure showed only a trivial advantage over non-failure training for hypertrophy (effect size 0.19, 95% CI 0.00 to 0.37, p=0.045).
Sub-group analysis found no significant advantage for training to momentary muscular failure versus stopping short of it (effect size 0.12, 95% CI -0.13 to 0.37, p=0.343).
Higher velocity-loss thresholds (over 25%) did not reliably produce more growth than moderate ones (20 to 25%), pointing to a non-linear proximity-to-failure and hypertrophy relationship.
Neither volume load (p=0.884) nor relative load (p=0.525) moderated the small failure-versus-non-failure effect on hypertrophy.
The authors conclude there is no evidence that going all the way to momentary failure is superior for hypertrophy, so leaving a few reps in reserve can grow muscle comparably.
A key limitation is that non-failure conditions rarely quantified the actual proximity-to-failure reached, which constrains precise practical prescriptions.

Reflections

No notes on this one yet. I add reflections as I finish or revisit a book.