The Claim
In untrained young men, performing three sets of knee extension exercises twice weekly for six weeks results in an 11.5% greater increase in knee extensor strength compared to performing one set of the same exercise under identical conditions.
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, doing three sets of knee extensions twice a week for six weeks leads to a larger increase in knee strength than doing only one set.
See the scientific wording
In untrained young men, performing three sets of knee extension exercises twice weekly for six weeks leads to a significantly greater increase in knee extensor strength (11.5%) compared to one set (4.0%), suggesting training volume has a muscle-group-specific effect on early-phase strength gains.
Doing more sets of an exercise causes more muscle fibers to fire during each contraction, which over time makes the muscles stronger by training them to use more of their total capacity.
What the research says
1 studyFor beginners, doing three sets of leg extensions builds stronger thighs than one set, but doing three sets of arm curls doesn’t make your biceps much stronger than one set — your legs respond better to more work than your arms do at first.
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.