When you train one arm or leg with weights, the other arm or leg doesn't get stronger or bigger—even though your body is adapting in other ways. This suggests those body-wide changes aren't enough to build muscle in the side you didn't train.
Claim Language
Language Strength
definitive
Uses definitive language (causes, prevents, cures)
The claim uses 'indicates' and 'are insufficient', which assert a conclusive causal relationship between the absence of muscle growth and the inadequacy of neural/systemic adaptations, implying certainty about the mechanism rather than possibility or correlation.
Context Details
Domain
exercise_science
Population
human
Subject
The absence of contralateral muscle hypertrophy or strength gains following unilateral resistance training
Action
indicates
Target
that neural or systemic adaptations are insufficient to induce muscle growth in the untrained limb under this protocol
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)
When people train one leg, only that leg gets bigger and stronger—even though their body releases the same hormones as usual. This means the other leg doesn’t grow because the body doesn’t send a strong enough signal to it, so the claim is right.