After a super intense 30-second sprint, sprint athletes have higher levels of certain chemicals in their blood and more acidic blood than endurance athletes during recovery — which means their bodies go through a bigger metabolic shake-up.

43

Pro

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Against

Evidence from Studies

Supporting (1)

43

Community contributions welcome

43

Growth hormone responses to treadmill sprinting in sprint- and endurance-trained athletes

Cross-Sectional Study

Human

1996

The study had sprint and endurance athletes do a short, all-out sprint and then checked their blood during recovery. Sprint athletes had higher ammonia and lactate levels and lower blood pH, just like the claim says.

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

Growth hormone responses to treadmill sprinting in sprint- and endurance-trained athletes

Score: 43

DOI: 10.1007/BF00242276

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.

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