When men and women do strength training, men tend to gain more muscle in their arms and chest than women, but both genders gain about the same amount of muscle in their legs and glutes.
Claim Language
Language Strength
probability
Uses probability language (may, likely, can)
The verb 'favors' suggests a tendency or likelihood rather than a guaranteed outcome, indicating probabilistic language. It does not claim certainty (e.g., 'causes' or 'always results in'), nor is it purely correlational (e.g., 'associated with').
Context Details
Domain
exercise_science
Population
human
Subject
males in healthy young to middle-aged adults
Action
favors
Target
absolute muscle hypertrophy following resistance training in the upper body but not the lower body
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 more muscle in their upper bodies, but not in their legs — just like the claim says.