The Claim
Twelve sessions of lower-body resistance training over six weeks, utilizing either 10-repetition maximum or 20-repetition maximum loads, are associated with increased vastus lateralis muscle thickness in healthy young men, with both training protocols producing similar hypertrophic responses compared to no training.
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.
Lifting weights twice a week for six weeks — whether using heavier or lighter weights — helps young, healthy guys build leg muscle just about the same amount, compared to not training at all.
See the scientific wording
Twelve sessions of lower-body resistance training over six weeks, using either 10-repetition maximum or 20-repetition maximum loads, is associated with increased vastus lateralis muscle thickness in healthy young men, with both protocols producing similar hypertrophic responses compared to no training.
When muscles are worked to fatigue with either heavy or light weights, the force on the muscle fibers and the buildup of metabolic byproducts activate signals that tell the muscle to build more protein, making the fibers thicker over time.
What the research says
1 studyThis study found that young men who lifted weights twice a week for six weeks—whether using heavier weights for fewer reps or lighter weights for more reps—both ended up with bigger leg muscles than those who didn’t lift at all. The muscle growth was about the same either way.
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.