Longer breaks between lifts make arms bigger
The Effect of Resistive Exercise Rest Interval on Hormonal Response, Strength, and Hypertrophy With Training
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
Two groups lifted weights with different rest times. One group rested 1 minute, the other 2.5 minutes. At first, the short-rest group had more stress hormones, but that faded. After 10 weeks, the long-rest group’s arms grew more, but both groups got equally strong.
Surprising Findings
Shorter rest periods caused higher hormone spikes in week 1—but didn’t lead to more muscle growth.
Common fitness lore says high testosterone after workouts = better hypertrophy. This study shows the opposite: the group with lower hormones ended up with 2.4x more arm growth.
Practical Takeaways
If your goal is bigger arms, rest 2.5 minutes between sets instead of 1 minute.
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
Two groups lifted weights with different rest times. One group rested 1 minute, the other 2.5 minutes. At first, the short-rest group had more stress hormones, but that faded. After 10 weeks, the long-rest group’s arms grew more, but both groups got equally strong.
Surprising Findings
Shorter rest periods caused higher hormone spikes in week 1—but didn’t lead to more muscle growth.
Common fitness lore says high testosterone after workouts = better hypertrophy. This study shows the opposite: the group with lower hormones ended up with 2.4x more arm growth.
Practical Takeaways
If your goal is bigger arms, rest 2.5 minutes between sets instead of 1 minute.
Publication
Journal
Journal of Strength and Conditioning Research
Year
2009
Authors
R. Buresh, K. Berg, J. French
Related Content
Claims (5)
When you lift weights and rest only 1 minute between sets, your body releases more stress and sex hormones right after the workout — but only at the very start; after a few weeks, this effect goes away.
If you rest longer between weightlifting sets (2.5 minutes instead of 1 minute), your arms grow bigger over 10 weeks — even if your strength doesn’t change.
Whether you rest 1 minute or 2.5 minutes between sets, your strength gains in squat and bench press end up being about the same after 10 weeks of training.
Even if your hormones spike a lot right after your first few workouts, that doesn’t mean you’ll grow more muscle or get stronger later on.
Increasing rest intervals between sets enhances total training tonnage, which amplifies mechanical tension accumulation and thereby increases the hypertrophic stimulus.