Doing certain types of hard arm exercises that lengthen the muscle while it's working can make your arms weaker and less flexible within a day.

39

Pro

0

Against

Evidence from Studies

Supporting (1)

39

Community contributions welcome

39

The effects of concentric and eccentric exercise performed at long muscle length on muscle damage

Randomized Controlled Trial

Human

2025 Dec

The study shows that after intense eccentric exercise at long muscle length, arm strength and movement decrease within a day, which matches the claim.

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

The effects of concentric and eccentric exercise performed at long muscle length on muscle damage

Score: 39

DOI: 10.1080/02640414.2025.2577034

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