After a tough workout, your body releases a chemical called IL-6, and people who gain more muscle tend to have more of it—but it’s probably just a side effect, not the reason your muscles grow.
Claim Language
Language Strength
association
Uses association language (linked to, correlated with)
The claim uses 'associated with' and 'may be', which indicate correlation or possibility rather than causation. 'Suggesting' further softens the tone, indicating inference without certainty.
Context Details
Domain
exercise_science
Population
human
Subject
The acute post-exercise increase in circulating interleukin-6 (IL-6)
Action
is associated with
Target
muscle hypertrophy following resistance training in young men
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 after workouts, a protein called IL-6 goes up in the blood, and people who gained more muscle had bigger spikes in IL-6—but other inside-the-muscle signals were even more connected to muscle growth, so IL-6 might just be a side effect, not the cause.