Analysis Version
v1
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Back to Study: Forearm rotation and elbow angle differentially mo...
correlational
Analysis v1
Strong Support

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.

34
Pro
0
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

The study found that when your elbow is slightly bent and you're not squeezing anything, your forearm muscle is stiffer when your palm is facing up (supination) than when it's facing down or sideways — exactly what the claim says.

Contradicting (0)

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

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

Similar Assertions

As you bend your elbow more and more, your forearm muscle gets looser — no matter if your palm is up, down, or sideways.

34
0
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No matter how you turn your hand while bending your elbow, the brachioradialis muscle works about the same amount.

26
0
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No matter how you turn your hand, the muscle on the outside of your forearm gets less stiff the more you bend your elbow.

34
0
88%

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

26
0
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When your palm is facing down and you bend your elbow slightly, your forearm muscle (brachioradialis) works harder than when your palm is up — it’s like your body uses this muscle more to help when your hand is in a 'handshake' position.

34
0
88%