The Claim

In untrained adults, shoulder width is strongly correlated with baseline dual-arm lean tissue mass, with a correlation coefficient of r = 0.76, indicating a structural relationship between skeletal frame size and existing muscle mass.

Source: Resistance training-induced appendicular lean tissue mass changes are largely unrelated to pre-training bone characteristics in a larger cohort of untrained adults

What the research says

Supports is higher

Support is ahead, but a single strong opposing study can change this.

Supports
42score
Challenges
0score

These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.

Correlation
1 study reviewed
In plain English

Wider shoulders usually mean more muscle in the arms — in people who don't train much, this link is pretty strong.

See the scientific wording

Shoulder width is strongly correlated with baseline dual-arm lean tissue mass (r = 0.76) in untrained adults, reflecting a structural relationship between skeletal frame size and existing muscle mass.

What the research says

1 study

  1. Study: Resistance training-induced appendicular lean tissue mass changes are largely unrelated to pre-training bone characteristics in a larger cohort of untrained adults

    The study found that people with wider shoulders tend to have more arm muscle mass before starting training, which is exactly what the claim says.

Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies

Fit Body Science verdict — we translate health claims into clear verdicts backed by peer-reviewed research.

Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.