If you only work out one leg with resistance training, that leg gets stronger, but the other leg doesn’t get stronger at all—even if you don’t train it.
Claim Language
Language Strength
definitive
Uses definitive language (causes, prevents, cures)
The claim uses 'leads to' and 'significant' to assert a direct and measurable outcome, and 'no corresponding improvement' to definitively state the absence of an effect—both are strong, non-probabilistic language indicating causation and certainty.
Context Details
Domain
exercise_science
Population
human
Subject
Unilateral resistance training
Action
leads to
Target
significant strength gains (increased 1RM) in the trained leg for leg press and knee extension exercises, with no corresponding improvement in the untrained leg
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)
The study had people lift weights with just one leg for 8 weeks and found that leg got stronger, but the other leg didn’t — exactly what the claim says.