The Claim
In untrained adults, performing single-joint knee extensions (70% 1RM, 5 sets of 10 reps, 2 sessions/week for 12 weeks) is associated with significantly greater rectus femoris hypertrophy (+13.2%) compared to multi-joint leg presses (+1.1%), suggesting that single-joint exercises may be more effective for targeting this specific muscle.
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.
For people who don't usually work out, using a knee extension machine grows the front thigh muscle much more than using a leg press machine.
See the scientific wording
In untrained adults, performing single-joint knee extensions (70% 1RM, 5 sets of 10 reps, 2 sessions/week for 12 weeks) is associated with significantly greater rectus femoris hypertrophy (+13.2%) compared to multi-joint leg presses (+1.1%), suggesting that single-joint exercises may be more effective for targeting this specific muscle.
What the research says
1 studyThe study found that leg extensions built more rectus femoris muscle than leg presses, which matches the claim.
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.