The Claim
In untrained collegiate women, 8 weeks of resistance training is associated with a significant increase in thigh cross-sectional area by 6.6 cm² but not with a significant change in arm cross-sectional area, indicating that regional hypertrophy differences may be driven by training frequency and volume rather than load intensity.
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.
In untrained female college athletes, 8 weeks of resistance training increased thigh muscle size by 6.6 cm² but did not change arm muscle size, suggesting that how often and how much they trained influenced where muscle growth occurred more than how heavy the weights were.
See the scientific wording
In untrained collegiate women, 8 weeks of resistance training is associated with a significant increase in thigh cross-sectional area (6.6 cm²) but not arm cross-sectional area, suggesting that training frequency and volume may drive regional hypertrophy differences more than load intensity.
When muscles are worked more often and with more total repetitions, they grow larger because the repeated stress triggers more protein building inside muscle fibers. Legs grow more than arms because they are trained more frequently and with more total work, even when the weight used is not heavier.
What the research says
1 studyAfter 8 weeks of lifting weights, these women’s thighs got noticeably bigger, but their arms didn’t — likely because they trained their legs more often than their arms. This supports the idea that how often and how much you train a muscle matters more than how heavy the weights are.
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.