If a young guy is holding his arm out straight while his shoulder is raised to shoulder height, he’ll get tired faster than if his shoulder is down at his side — even if he’s using the same amount of effort with his elbow.

33

Pro

0

Against

Evidence from Studies

Supporting (1)

33

Community contributions welcome

33

Effect of shoulder angle on the activation pattern of the elbow extensors during a submaximal isometric fatiguing contraction

Cross-Sectional Study

Human

2010 Oct

The study found that when people held their arm out in front of them (shoulder up at 90°), they got tired faster doing a light elbow-straightening task than when their arm was down (shoulder at 0°). This supports the idea that shoulder position affects how long you can go before tiring.

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

Effect of shoulder angle on the activation pattern of the elbow extensors during a submaximal isometric fatiguing contraction

Score: 33

DOI: 10.1002/mus.21717

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