Even though your body is still pumping out a stress hormone after nine sprints, your muscles stop breaking down sugar and making lactic acid during the tenth sprint — like your body’s alarm system is...

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Evidence from Studies

Supporting (1)

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Human muscle metabolism during intermittent maximal exercise.

Cross-Sectional Study

Human

1993 Aug

Contradicting (0)

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No contradicting evidence found

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Source Study

Human muscle metabolism during intermittent maximal exercise.

Score: 28

DOI: 10.1152/jappl.1993.75.2.712

Similar Assertions

Even though the person gets much weaker during their 10th sprint compared to the first, their muscles aren’t producing more lactic acid — which is weird because their stress hormone (epinephrine) is high, and you’d expect lactic acid to rise. So something is shutting down the energy system that usually makes lactic acid.

75%