When you lean back a bit, your legs can push harder at the knee even though your muscles aren't working any harder—this might be because of how your body is positioned, not because your brain is...

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Against

Evidence from Studies

Supporting (1)

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Enhancement of knee extension voluntary and electrically-evoked strength with the body tilted backward

Cross-Sectional Study

Human

Contradicting (0)

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No contradicting evidence found

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.

Source Study

Enhancement of knee extension voluntary and electrically-evoked strength with the body tilted backward

Score: 27

DOI: 10.3233/IES-193197

Similar Assertions

If you're sitting reclined back a bit (like leaning back in your office chair), your leg muscles can push a little harder than if you're leaning forward—by about 5 to 11%—at least in healthy adults.

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Leaning back during leg extensions might make your front thigh muscle work harder and grow more because it stretches the muscle more during the move.

73%