The Claim
In resistance-trained females performing the barbell back squat, the gluteus maximus-to-hamstring co-activation ratio is maximized at 80% of one-repetition maximum during the ascending phase, indicating that this load may optimize relative gluteal muscle engagement compared to hamstring activation.
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 80% of their max weight, their butt muscles work way harder compared to their hamstrings — more than with lighter or heavier weights.
See the scientific wording
In resistance-trained females performing the barbell back squat, gluteus maximus-to-hamstring co-activation ratio is highest at 80% of one-repetition maximum during the ascending phase, suggesting this load may optimize relative gluteal engagement compared to hamstring activity.
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 lift weights do the upward part of the squat with 80% of their max weight, their glutes work more compared to their hamstrings than at other weights—just like the claim says.
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.