The Claim
Performing hip extension during leg extension exercises increases rectus femoris muscle length, leading to greater muscle hypertrophy, particularly in the mid to upper regions, compared to training with the muscle in a shortened position.
What the research says
Challenges is higher
Challenge is ahead, but a single strong supporting 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.
If you stretch your hips back while doing leg extensions, your quad muscle gets longer and grows more—especially in the middle and upper parts—than if you do the exercise with your hips bent.
See the scientific wording
Hip extension during leg extensions increases rectus femoris muscle length and results in greater hypertrophy, particularly in the mid to upper regions, compared to training in a shortened position.
What the research says
3 studiesThe study found that doing leg extensions with hips more extended (less bent) led to more rectus femoris growth, which matches the idea that stretching the muscle during exercise helps it grow more.
The study looked at how different hip positions affect muscle activity during leg extensions, but it didn’t measure actual muscle growth, so we can’t say for sure if one position builds more muscle over time.
Related videos
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 3 supporting studies
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.