The Claim

In healthy adult men, a single session of sprint interval exercise consisting of five 10-second all-out bouts with 50-second active recovery between bouts does not significantly change salivary testosterone or cortisol concentrations, regardless of whether the individuals are endurance-trained, strength-trained, or non-trained, indicating that this low-volume protocol does not produce an acute hormonal stress response.

Source: Effects of Dominance and Sprint Interval Exercise on Testosterone and Cortisol Levels in Strength-, Endurance-, and Non-Training Men

What the research says

Supports is higher

Support is ahead, but a single strong opposing study can change this.

Supports
44score
Challenges
0score

These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.

Cause and effect
1 study reviewed
In plain English

A quick, very hard workout (5 bursts of 10-second sprints with short rests) does not change the amount of testosterone or cortisol in your saliva, whether you are fit or not. So this type of short exercise is not enough to trigger a stress hormone response.

See the scientific wording

In healthy adult men, a single session of sprint interval exercise consisting of 5 × 10-second all-out bouts with 50-second active recovery does not significantly change salivary testosterone or cortisol concentrations in endurance-trained, strength-trained, or non-trained individuals, suggesting that this low-volume protocol is insufficient to elicit an acute hormonal stress response.

Why this might work

The exercise is made of only a few very short, hard efforts with rest in between. This is not enough stress to make the body produce more stress hormones like cortisol or testosterone. The body needs a longer or more intense workout to turn on those hormone responses.

Hypothetical mechanismbased on 1 study

What the research says

1 study

  1. Study: Effects of Dominance and Sprint Interval Exercise on Testosterone and Cortisol Levels in Strength-, Endurance-, and Non-Training Men

    The study did the exact workout described in the claim (5 short sprints with quick rests) and found that testosterone and cortisol levels did not change much after it, so the workout is too light to cause a big stress response in men, no matter how they train.

Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies

Fit Body Science verdict — we translate health claims into clear verdicts backed by peer-reviewed research.

Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.