The Claim
In untrained young men, the magnitude of strength gains in response to increased training volume differs between upper body muscles (elbow flexors) and lower body muscles (knee extensors) during the first six weeks of resistance training, with knee extensors exhibiting greater sensitivity to volume increases.
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 sets during resistance training leads to greater strength gains in the knee extensors than in the elbow flexors over the first six weeks.
See the scientific wording
The effect of training volume on strength gains differs between upper and lower body muscles in untrained young men, with knee extensors showing greater sensitivity to increased sets than elbow flexors during the first six weeks of resistance training.
When untrained men start lifting weights, the muscles in the legs activate more nerve signals and recruit more muscle fibers with each set than the arm muscles do, so adding more sets makes the legs stronger faster.
What the research says
1 studyWhen people start lifting weights, doing more sets helps legs get stronger faster than arms—this study found that legs needed three sets to improve, but arms got just as strong with only 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.