If you rest less between sets at the gym, you might get too tired to lift as much overall, which could slow down your muscle and strength gains over time.
Evidence from Studies
Supporting (1)
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Increased Neuromuscular Activity, Force Output, and Resistance Exercise Volume When Using 5-Minute Compared with 2-Minute Rest Intervals Between the Sets
The study found that resting only 2 minutes between sets made people more tired and weaker during later sets, and they couldn’t do as much work overall compared to resting 5 minutes—supporting the idea that shorter rests can hurt muscle gains over time.
Contradicting (3)
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Give it a rest: a systematic review with Bayesian meta-analysis on the effect of inter-set rest interval duration on muscle hypertrophy
The study looked at how rest time between sets affects muscle growth and found that while resting a bit longer might help a little, shorter rests don’t ruin your gains like the claim suggests.
Effects of rest intervals and training loads on metabolic stress and muscle hypertrophy
The study looked at short vs long rest periods but made sure both groups did the same total amount of work. It found that shorter rests actually led to more muscle growth, not less.
The study looked at whether taking short or long breaks between sets affects muscle growth. It found both can work, with longer breaks possibly being a bit better, but short breaks still lead to gains.
Gold Standard Evidence Needed
According to GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this specific claim, ordered from strongest to weakest evidence.