When your palm is up or straight, your bicep gets stiffest when your elbow is bent at 60 degrees — but if your palm is down, it gets less stiff the more you bend your elbow.

34

Pro

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Against

Evidence from Studies

Supporting (1)

34

Community contributions welcome

34

Forearm rotation and elbow angle differentially modulate biceps brachii and brachioradialis muscle stiffness and EMG activity during low-load isometric contractions: a cross-sectional study in healthy individuals

Cross-Sectional Study

Human

2025 Jul 2

When you bend your elbow with your palm up or facing forward, your bicep gets stiffest at a 60-degree bend — but if your palm is facing down, it gets less stiff the more you bend your elbow. This study proved that.

Contradicting (0)

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No contradicting evidence found

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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

Forearm rotation and elbow angle differentially modulate biceps brachii and brachioradialis muscle stiffness and EMG activity during low-load isometric contractions: a cross-sectional study in healthy individuals

Score: 34

DOI: 10.1186/s13102-025-01226-y

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