The Claim
In untrained young men, the magnitude of muscle hypertrophy and strength gains in response to increased training volume is greater for lower-body muscles than for upper-body muscles.
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 young men, increasing the number of workouts leads to larger muscle growth and strength gains in the legs compared to the arms.
See the scientific wording
The effect of training volume on muscle hypertrophy and strength gains differs between upper and lower body muscles in untrained young men, with lower-body adaptations showing greater sensitivity to increased volume than upper-body adaptations.
When lower-body muscles are trained with more sets, they experience greater force and fatigue during each workout, which triggers stronger signals inside muscle cells to build more protein and grow larger. This growth makes the muscles stronger. Upper-body muscles do not respond the same way — even with more sets, they do not generate the same level of internal signals or protein buildup.
What the research says
1 studyIn guys who’ve never lifted before, doing more sets of leg exercises made their legs much stronger and bigger, but doing more sets of arm exercises didn’t make their arms any stronger or bigger than doing just one set.
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.