Most of what we know about how much to lift and how often comes from young men who already work out—so we don’t know if it works the same way for women, older people, or beginners.
Scientific Claim
The current evidence base for resistance training dose-response relationships is primarily derived from young, male, trained individuals, and findings may not apply to women, older adults, or untrained populations.
Original Statement
“67 total studies of 2058 participants (79.1% male, 20.9% female; average age 25.16 ± 5.22 years). All models were adjusted for the duration of the intervention and training status.”
Evidence Quality Assessment
Claim Status
appropriately stated
Study Design Support
Design supports claim
Appropriate Language Strength
association
Can only show association/correlation
Assessment Explanation
The claim accurately reflects the demographic limitations of the included studies without overgeneralizing or making causal claims.
Evidence from Studies
Supporting (1)
The Resistance Training Dose Response: Meta-Regressions Exploring the Effects of Weekly Volume and Frequency on Muscle Hypertrophy and Strength Gains.
Most of the people in this study were young men who already trained, so the results might not work for women, older people, or beginners — which is exactly what the claim says.