When men and women do strength training, men tend to gain a little more muscle size than women—not because they work harder, but because they usually start with more muscle to begin with.
Claim Language
Language Strength
probability
Uses probability language (may, likely, can)
The claim uses 'likely due to', which indicates a probable explanation rather than a definitive cause. 'Favors' suggests a tendency or trend, not a guaranteed outcome, placing it in the probability category.
Context Details
Domain
exercise_science
Population
human
Subject
healthy young to middle-aged adults
Action
favors
Target
absolute muscle hypertrophy following resistance training
Intervention Details
Gold Standard Evidence Needed
According to GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this specific claim, ordered from strongest to weakest evidence.
Evidence from Studies
Supporting (1)
Sex differences in absolute and relative changes in muscle size following resistance training in healthy adults: a systematic review with Bayesian meta-analysis
This study found that when men and women do the same weight training, men tend to gain a little more muscle in total size — mostly because they start with more muscle to begin with. The data backs up the claim.