When young guys who’ve never lifted weights before start training, how much their muscles grow depends a lot on what’s happening inside the muscle itself—like changes in certain proteins—not so much on hormones floating in their blood.
Claim Language
Language Strength
probability
Uses probability language (may, likely, can)
The claim uses 'explain' and 'suggesting', which indicate a probabilistic or inferential relationship rather than a definitive cause. 'Explain 46% of the variability' implies a statistical contribution, not a guaranteed mechanism, and 'suggesting' introduces a tentative interpretation.
Context Details
Domain
exercise_science
Population
human
Subject
young, untrained males
Action
explain
Target
46% of the variability in muscle hypertrophy after 16 weeks of resistance training
Intervention Details
Gold Standard Evidence Needed
According to GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this specific claim, ordered from strongest to weakest evidence.
Evidence from Studies
Supporting (1)
Muscular and Systemic Correlates of Resistance Training-Induced Muscle Hypertrophy
The study found that in guys who lifted weights for 16 weeks, how their muscles changed inside (like protein signals) predicted how much they grew better than their hormone levels did. So, what happens inside the muscle matters more than hormones in the blood.