After 15 weeks of leg workouts, the men’s quadriceps muscles grew by about 13%, measured precisely with MRI scans.
Scientific Claim
In previously untrained young men, high-resolution MRI-measured quadriceps muscle volume increased by 12.7% after 15 weeks of lower body resistance training, providing a sensitive and reliable measure of hypertrophy.
Original Statement
“Quadriceps volume (cm3) increased from 1980.2 ± 381.3 to 2217.7 ± 383.2 (12.7 ± 7.1%).”
Evidence Quality Assessment
Claim Status
appropriately stated
Study Design Support
Design supports claim
Appropriate Language Strength
association
Can only show association/correlation
Assessment Explanation
This is a descriptive finding of change magnitude, not a causal or correlational claim. The language accurately reflects the observed data without overinterpretation.
Evidence from Studies
Supporting (1)
This study found that when untrained guys lifted weights for 15 weeks, their thigh muscles got much bigger — and they used super detailed scans (MRI) to prove it, which means the scans are reliable for measuring muscle growth.