When eight trained bodybuilders did arm curls with heavy weights, their muscles made more lactic acid the more sets they did — which means their bodies were working so hard they had to rely on a fast, oxygen-free energy system.

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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 had bodybuilders do heavy arm curls and measured how much lactic acid built up in their muscles — and it found exactly the same numbers as the claim says, so the claim is backed up by real data.

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 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

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81%

When you push your muscles super hard until you can't do another rep, your muscles build up a lot of lactic acid—this means your body is burning energy without oxygen and getting more acidic inside.

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78%