When you raise your arm to the side and twist it inward like in the Jobe test, it makes the main shoulder muscle less effective at lifting your arm because the leverage isn't as good.

Evidence from Studies

Supporting (1)

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Shoulder abduction moment arms in three clinically important positions.

Computational/Algorithm Study

Human

2009 Jul-Aug

The study shows that when the arm is raised to the side and twisted inward (like in the Jobe test), the supraspinatus muscle has less leverage to lift the arm, which is exactly what the claim says.

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

Shoulder abduction moment arms in three clinically important positions.

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DOI: 10.1016/J.JSE.2008.10.021

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When your arm is resting down at your side, the supraspinatus muscle in your shoulder is in the best position to start lifting your arm out to the side—better than other nearby muscles—so doctors might use this position to test how well it’s working.

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