When eight trained bodybuilders did heavy arm curls, their muscle energy stores dropped a lot after just one set and still stayed low after three sets, showing their muscles were burning through quick energy fast.

28

Pro

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Against

Evidence from Studies

Supporting (1)

28

Community contributions welcome

28

Muscle Substrate Utilization and Lactate Production During Weightlifting

Cross-Sectional Study

Human

1999 Jun

The study looked at bodybuilders doing heavy arm curls and found their muscle energy stores dropped by the exact same amounts as the claim said — so the claim is right.

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

Muscle Substrate Utilization and Lactate Production During Weightlifting

Score: 28

DOI: 10.1139/h99-017

Similar Assertions

When bodybuilders lift heavy weights with their arms, their muscles get tired first because they run out of a quick energy source called phosphocreatine, but after the first set, the burn they feel comes mostly from acid building up in the muscles.

28

0

80%

When eight trained bodybuilders did arm curls with heavy weights, their muscles used up a bit of stored sugar—12% after one round and 24% after three rounds—showing that even short, intense weightlifting burns some muscle fuel.

28

0

75%