The Claim
The majority of included studies focused on untrained individuals and lower-body exercises, which limits the generalizability of the findings to trained populations and upper-body resistance training.
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.
Most studies in this review involved people who had not trained before and focused on leg exercises, so the results may not apply to trained individuals or exercises that target the upper body.
See the scientific wording
The majority of included studies focused on untrained individuals and lower-body exercises, limiting the generalizability of findings to trained populations and upper-body resistance training.
When someone has never lifted weights before, their muscles and nerves learn to work together more efficiently just from doing any kind of resistance exercise, but this learning doesn't fully carry over to people who already train regularly or to different parts of the body like the arms.
What the research says
1 studyThis study looked at past research on weight training, and most of that past research used people who weren’t experienced lifters and tested leg strength, not upper body — so the claim is right.
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.