The Claim
Do longer rest periods between sets help build more muscle in arms and legs?
What the research says
Supports is higher
Support is ahead, but a single strong opposing study can change this.
These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.
Taking a bit more than a minute between sets when lifting weights might help your arms and legs grow slightly more muscle, but the difference is so small it might not matter much in real life.
See the scientific wording
For resistance training targeting the arms and thighs, inter-set rest intervals longer than 60 seconds likely provide a small hypertrophic benefit compared to intervals of 60 seconds or less, with standardized mean differences of approximately 0.13–0.17, though the probability of this difference exceeding a small effect size is only 45–54%, indicating uncertain practical significance.
What the research says
1 studyThe Bayesian meta-analysis of controlled effect sizes from 9 RCTs directly compared rest intervals ≤60s vs. >60s for arm and thigh hypertrophy, showing small but consistent SMDs favoring longer rest, with credible intervals crossing zero, indicating probabilistic benefit without certainty.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.