The Claim
When training volume is equated, resistance training protocols using 4RM, 8RM, and 12RM repetitions produce similar increases in muscle hypertrophy, specifically approximately 10-11% pectoralis major volume gain over 10 weeks, in untrained young men performing bench press exercises, indicating that hypertrophy depends primarily on total volume rather than specific repetition ranges.
What the research says
Supports is higher
Support is ahead, but a single strong opposing study can change this.
These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.
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.
See the scientific wording
When training volume is equated, resistance training protocols using 4RM, 8RM, and 12RM repetitions produce similar increases in muscle hypertrophy (approximately 10-11% pectoralis major volume gain over 10 weeks) in untrained young men performing bench press exercises, indicating that hypertrophy depends primarily on total volume rather than specific repetition ranges.
What the research says
1 studyThe study did the exact same training as the claim described and found that all rep ranges grew muscle about the same when total work was equal, which matches the claim.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.