CrossFit vs. running intervals: which boosts elite runner performance at altitude?
NCT ID NCT07675577
First seen Jun 30, 2026 · Last updated Jul 01, 2026 · Updated 1 time
Summary
This trial compares two high-intensity training programs—CrossFit and running-based HIIT—in elite male distance runners who live and train at moderate altitude. Over six weeks, participants train five days per week and undergo tests for aerobic fitness, strength, and blood markers. The goal is to see which approach better improves race performance and physiological adaptations.
What this could mean
Our plain-language read of the trial. This is informational only — not medical advice or a prediction.
Active substance
CrossFit training and running-based high-intensity interval training (HIIT)
What this could lead to
If one program proves superior, it could help coaches tailor training for elite runners to boost both endurance and strength.
What could go wrong
This is a small, early-stage study in a very specific group (elite male runners at altitude), so results may not apply to other athletes or conditions.
Disclaimer
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Summaries may miss details or leave out important information. Before applying or accepting participation, make sure you have read and understood the full study. Curemydisease.com takes no responsibility whatsoever for anything missed, misunderstood, or acted upon as a result of our summary — we know it does not capture everything.
This is a summary of the original study . Summaries may miss details or leave out important information. Before applying or accepting participation, make sure you have read and understood the full study. Curemydisease.com takes no responsibility whatsoever for anything missed, misunderstood, or acted upon as a result of our summary — we know it does not capture everything.
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Conditions
The condition(s) this trial relates to.
As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.
Contacts and locations
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Locations
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Sport Sciences Department, University of Sistan and Baluchestan
Zahedan, Sistan and Baluchestan, 98135-986, Iran