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quantitative
Analysis v1
Supported

When untrained young men lift weights with different heavy loads but equal total work, their chest muscles grow about the same amount—around 10-11% bigger.

47
Pro
40
Against

Evidence from Studies

Supporting (2)

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Community contributions welcome

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Effects of 4, 8, and 12 Repetition Maximum Resistance Training Protocols on Muscle Volume and Strength.

Randomized Controlled Trial
Human
2021 Apr 1

The study found that lifting weights with different rep ranges but the same total work led to similar muscle growth in the chest, just like the claim said.

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Effects of 4, 8, and 12 Repetition Maximum Resistance Training Protocols on Muscle Volume and Strength.

Randomized Controlled Trial
Human
2021 Apr 1

The study did the same training as the claim says and found that all three types of workouts made chest muscles grow about the same amount, which matches what the claim says.

Contradicting (1)

40

Community contributions welcome

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Effects of different intensities of resistance training with equated volume load on muscle strength and hypertrophy

Randomized Controlled Trial
Human
2018 Jul

The study used different weights (like 20% to 80% of max) and found that heavier weights grew muscles more than lighter ones, which goes against the idea that all weights work the same for muscle growth when volume is matched.

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.

Similar Assertions

If you do the same total amount of weightlifting work, lifting heavy weights a few times or lighter weights more times gives about the same muscle growth in the chest for beginners doing bench press, showing that the total work matters more than how many reps you do.

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0
83%

When you lift weights, how much total work you do matters more for getting stronger and bigger than whether you use heavy weights with few reps or light weights with many reps.

45
0
77%

Doing more sets of weightlifting each week helps you build more muscle, but after a certain point, adding even more sets gives you less extra benefit.

48
0
76%

Doing more weightlifting each week helps you build more muscle—but only up to a point. After a certain number of sets, doing even more doesn’t help much more.

48
0
75%

If you do the same total amount of weightlifting work, lifting heavier weights fewer times or lighter weights more times gives men about the same muscle growth.

47
0
74%

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