When scientists looked at how each person changed over time (not just comparing different people), they found a much stronger link between muscle growth and strength than previous studies using different methods.
Scientific Claim
Within-participant correlation methods reveal significantly stronger associations between muscle growth and strength gains than between-participant methods in young men undergoing resistance training, with r = 0.89–0.92 versus r = 0.35–0.60.
Original Statement
“Repeated-measures correlation... demonstrated that strength gains and muscle growth are, in fact, very strongly related (r = 0.89–0.92)... Between-participant correlation analysis... revealed markedly weaker relationships... (r = 0.35–0.60).”
Evidence Quality Assessment
Claim Status
appropriately stated
Study Design Support
Design supports claim
Appropriate Language Strength
association
Can only show association/correlation
Assessment Explanation
The claim accurately describes comparative correlation magnitudes without implying causation. The verb 'reveal' is appropriate for observational comparisons of statistical associations.
Evidence from Studies
Supporting (1)
This study found that when they looked at how each person changed over time, their muscles growing was super closely linked to them getting stronger — way more than just comparing different people’s averages.