The Claim
In middle-aged women, resistance training with free weights (6–8 sets per muscle group per week at 50–75% 1-RM) increases fat-free mass and muscle mass in pre-menopausal women but does not increase fat-free mass or muscle mass in post-menopausal women, despite identical training volume and intensity, with a strong effect size for muscle mass (d = 1.25) in pre-menopausal women.
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.
Middle-aged women who train with free weights at 6–8 sets per muscle group per week at 50–75% of their one-rep maximum gain more muscle and fat-free mass if they are pre-menopausal, but do not gain muscle or fat-free mass if they are post-menopausal, even when doing the same workout.
See the scientific wording
In middle-aged women, resistance training with free weights (6–8 sets per muscle group per week at 50–75% 1-RM) increases fat-free mass and muscle mass only in pre-menopausal women, with a strong effect size for muscle mass (d = 1.25), while post-menopausal women show no significant gains despite identical training volume and intensity.
In women who still produce estrogen, resistance training triggers muscle growth because estrogen boosts the muscle's ability to build new protein and activate repair cells. In women who no longer produce estrogen, the same training does not trigger muscle growth because the muscle cannot respond to the workout signal without estrogen.
What the research says
1 studyWomen who haven’t gone through menopause gained more muscle and lean body mass from the same weight training routine than women who had gone through menopause — even though everyone did the exact same workouts.
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.