When you lift super heavy weights until you can't do another rep, your muscles use up a lot of their stored sugar (glycogen) to keep going — this shows your body is breaking down that sugar fast to power your workout.

26

Pro

0

Against

Evidence from Studies

Supporting (1)

26

Community contributions welcome

26

Muscle metabolism during intense, heavy-resistance exercise

Cross-Sectional Study

Human

1986

The study had athletes do super hard weightlifting until they couldn’t do another rep, and found their muscles used up a lot of stored sugar (glycogen), just like the claim said.

Contradicting (0)

0

Community contributions welcome

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 metabolism during intense, heavy-resistance exercise

Score: 26

DOI: 10.1007/bf00422734

Similar Assertions

Lifting weights once can use up a lot of the sugar stored in your thigh muscles, which your body needs for energy during hard exercise.

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After a short, super-hard workout, your muscles refill their energy stores way faster than after a long, slow one—even if you eat the same amount of carbs.

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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.

26

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Lifting weights refills muscle energy slower than sprinting or HIIT, maybe because you don’t build up as much lactic acid and your muscles get more sore from stretching under load.

1

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People who don’t lift weights regularly burn more sugar from their muscles during a workout than people who lift regularly.

50

0

79%