Your bicep doesn’t work harder or softer when you turn your hand palm-up, palm-down, or straight ahead — it just keeps doing the same amount of work.

26

Pro

0

Against

Evidence from Studies

Supporting (1)

26

Community contributions welcome

26

Muscular coordination of biceps brachii and brachioradialis in elbow flexion with respect to hand position

Cross-Sectional Study

Human

2015

Even when people turn their hands different ways while bending their elbow, their biceps muscle works just as hard — and this study proved it.

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

Muscular coordination of biceps brachii and brachioradialis in elbow flexion with respect to hand position

Score: 26

DOI: 10.3389/fphys.2015.00215

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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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