The Claim
In resistance-trained females performing the barbell back squat, mean muscle activity in the vastus lateralis, vastus medialis, rectus femoris, gluteus maximus, semitendinosus, and biceps femoris is significantly greater during the ascending phase of the movement at 90% of one-repetition maximum (1RM) compared to loads ranging from 40% to 70% 1RM, indicating increased neuromuscular demand at higher intensities.
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.
When women who lift weights do squats with a really heavy weight (close to their max), their leg and butt muscles have to work a lot harder than when they use lighter weights.
See the scientific wording
In resistance-trained females performing the barbell back squat, mean muscle activity in the vastus lateralis, vastus medialis, rectus femoris, gluteus maximus, semitendinosus, and biceps femoris increases significantly at 90% of one-repetition maximum (1RM) compared to loads between 40% and 70% 1RM during the ascending phase of the movement, indicating greater neuromuscular demand at higher intensities.
What the research says
1 studyStudy: Effect of external load on muscle activation during the barbell back squat
The study found that when women who are used to lifting squat with very heavy weights (90% of their max), their leg and butt muscles work much harder than with lighter weights, which supports 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.