When these men got stronger, their muscle signals (measured by EMG) also got stronger—but not as strongly as their muscles grew.
Scientific Claim
In previously untrained young men, changes in normalized quadriceps surface electromyography amplitude during maximal contractions are moderately associated with increases in isometric knee extension strength (r = 0.58) and one-repetition maximum strength (r = 0.56) after 15 weeks of resistance training.
Original Statement
“Changes in surface electromyography amplitude were moderately correlated with the changes in strength (iMVT: r = 0.58, P < 0.001; 1RM: r = 0.56, P < 0.001).”
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 uses 'associated' and reports correlation coefficients, matching the observational design. The authors appropriately avoid causal language and correctly frame this as a moderate association.
Evidence from Studies
Supporting (1)
The study found that when young men got stronger after lifting weights, their muscle electrical activity also increased — and this change was moderately linked to how much stronger they got, just like the claim said.