The Claim
Volume-equated resistance training protocols using 4RM, 8RM, and 12RM loads produce similar hypertrophy (~10-11% volume increase) in the pectoralis major muscle among untrained young men.
What the research says
Roughly balanced
Support and challenge are close. The picture may shift as more studies come in.
These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.
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.
See the scientific wording
Volume-equated resistance training with 4RM, 8RM, and 12RM protocols produces similar pectoralis major hypertrophy (~10-11% volume increase) in untrained young men.
What the research says
3 studiesThe 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.
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.
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.
Related videos
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 3 supporting studies
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.