When you bend your elbow by lifting something, the brachioradialis muscle works much harder pushing up than it does lowering the weight slowly.

26

Pro

0

Against

Evidence from Studies

Supporting (1)

26

Community contributions welcome

26

The function of brachioradialis.

Cross-Sectional Study

Human

2008 Dec

The study found that the brachioradialis muscle works harder when bending the elbow by pulling (concentric) than when lowering the weight slowly (eccentric), no matter how the hand is turned — just like the claim says.

Contradicting (0)

0

Community contributions welcome

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

The function of brachioradialis.

Score: 26

DOI: 10.1016/j.jhsa.2008.07.019

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No matter how you turn your hand while bending your elbow, the brachioradialis muscle works about the same amount.

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When your palm faces down and you bend your elbow, your forearm muscle (brachioradialis) works harder than when your palm faces up or straight ahead — but your bicep works the same no matter how your hand is turned.

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Even when you're not trying to bend your elbow, the muscle on the outside of your forearm feels stiffer if your palm is facing up than if it's facing down or straight ahead.

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When your palm is facing down and you bend your elbow with a light weight, the muscle on the outside of your forearm works harder than when your palm is up.

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