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When measuring overall body muscle growth using common scans like DXA, resting longer or shorter between sets doesn’t seem to make any real difference — and shorter rest might even look a tiny bit better, but it’s probably just noise.
Quantitative
Resting more than a minute and a half between sets doesn’t seem to help you build more muscle than resting for about a minute — it’s not worth the extra time.
Taking a bit more time to rest between weightlifting sets might help your arms and thighs grow a tiny bit more, but the difference is so small it might not even matter in real life.
We can’t say for sure that drop sets caused the muscle growth because we don’t know if participants were randomly assigned to groups.
Descriptive
This study only looked at young men doing triceps exercises, so we don’t know if these results apply to anyone else.
Even though drop sets felt harder and made muscles swell more, they didn’t make the body produce more lactic acid or raise the heart rate more than regular sets.
Drop sets made guys feel more tired and their muscles puff up more after one workout, but they didn’t make them stronger in the long run than regular sets.
Mechanistic
Even though both groups trained the same amount of time, the regular three-set group got stronger faster than the drop set group.
The muscle growth from drop sets was noticeably bigger than from regular sets, based on how scientists measure the size of the effect.
After one workout, guys who did drop sets were temporarily weaker than before, more so than those who did regular sets.
Even though guys doing drop sets did only one set instead of three, their muscles grew just as much or more than those who did three sets.
Drop sets made muscles puff up more and felt harder, but didn’t make the body produce more lactic acid or raise the heart rate more than regular sets.
Both kinds of weight training—whether you do one hard set or three regular ones—made young men’s triceps bigger and stronger after six weeks.
Even though drop sets felt harder and made muscles swell more, they didn’t make the blood more acidic or the heart beat faster than regular sets.
People felt like they worked much harder during drop sets than during regular sets, even though they did fewer total sets.
After just one workout, drop sets made muscles swell more and temporarily made guys weaker than before, while regular sets didn’t cause these changes.
After six weeks, guys who did regular three-set workouts got stronger in their triceps more than those who did drop sets, even though both groups improved.
Doing one set of weights with decreasing weight without resting (drop sets) made young men’s triceps muscles grow more than doing three regular sets over six weeks.
All the research so far is on young, experienced male lifters — we don’t know if drop sets work the same for women, older people, or beginners.
Some experts think drop sets are safer on machines because you’re less likely to get hurt when you’re too tired to lift — but no study actually tested this.
The results were very consistent across all the studies — no matter which drop set method was used, the muscle growth results were similar.
The studies didn’t hide negative results — the data look balanced, so we can trust the overall finding that drop sets aren’t better than regular training.
The studies weren't perfect — some didn't report enough details, and one didn't match the workout volume, which could affect how we interpret the results.
Even though drop sets sound like they should make muscles grow more by keeping them under stress longer, they don’t actually make you bigger than regular workouts.