The Claim
Among healthy adult males aged 18–40, resistance training is associated with no significant difference in muscle mass gain between untrained and trained individuals, although the highest gains are observed in those with 4 or more years of training experience, indicating that training status does not consistently moderate the hypertrophic response to resistance training in this population.
What the research says
Not yet evaluated
We are still looking at what the research says.
These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.
If you're a guy between 18 and 40 and you start lifting weights, whether you're new to it or have been doing it for years, you probably won't gain much more muscle just because you're experienced—but the people who’ve trained the longest (4+ years) still tend to gain the most muscle, so experience doesn’t always make a clear difference.
See the scientific wording
Resistance training is associated with no significant difference in muscle mass gain between untrained and trained healthy adult males aged 18–40, though the highest gains were observed in those with 4+ years of experience, suggesting training status alone does not consistently moderate hypertrophic response in this age group.
Score breakdown, mechanism chain, raw evidence, ideal studies needed
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.