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CrossFit vs. running intervals: which boosts elite runner performance at altitude?

NCT ID NCT07675577

Knowledge-focused Sponsor: University of Sistan and Baluchestan Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now
This trial is taking on new participants right now.
Not yet recruiting
Registered, but not yet taking participants.
By invitation only
Not open to general applications. Only people the study team invites can take part.
Paused
Paused for now. It may or may not start again.
Ongoing
Running, but no longer taking on new participants.
Completed This study
The trial has finished. Results may not be published yet.
Stopped early
Stopped early, before it reached the end. That can be for many reasons, including safety.
Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

Expanded access
Not a trial. This treatment can be requested outside a study, case by case, for people who qualify.
Expanded access (paused)
Not a trial. The treatment can normally be requested outside a study, but is unavailable right now.
Expanded access (ended)
Not a trial. The treatment could once be requested outside a study, but no longer can.
Approved
The treatment has been approved, so it is available normally rather than through this programme.

When the status isn't known

Details not published
The full record has not been published yet, so there is little to show here.
Status unknown
This status has not been confirmed recently, so it may be out of date.

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.

This is an AI summary of the original study and may miss details. Read our disclaimer.

Study facts

What this study's own registry entry says, in plain language.

Phase

Not a phased trial

Phase numbers describe drug development. The registry uses this when they do not apply, as it does for trials of devices, procedures or behaviour changes, and for observational studies.

Participants

36 people

The number who actually took part.

Started

Sep 2021

Finished

Oct 2021

Lead sponsor

Other sponsor

The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.

Who can take part

This study's own entry requirements. Only the study team can say for certain whether you qualify.

Ages

25 to 35 years

Sex

Male participants only

Healthy volunteers

Accepted

You do not need to have the condition being studied to take part.

Show the full entry requirements

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * Nationally ranked elite male middle- or long-distance runner * Ranked within the national top 10 in their respective primary competitive event * Aged between 25 and 35 years * Minimum of six months of structured high-intensity training prior to enrollment, defined as more than five supervised sessions per week * Living and training year-round at moderate altitude (approximately 1,400 m) in Zahedan, Iran * Competing in one of the following event categories: middle-distance (800-3,000 m) or long-distance (≥5,000 m) * Willing and able to provide written informed consent prior to participation * Able to commit to five supervised training sessions per week for the full six-week intervention period Exclusion Criteria: * Musculoskeletal injury within the three months preceding enrollment * Current or recent use of performance-enhancing substances * Use of new nutritional supplements during the study period * Any medical condition or physical limitation that could interfere with safe participation in high-intensity exercise training * Inability to complete the required number of training sessions due to scheduling conflicts or other commitments * Incomplete study application or failure to meet all inclusion criteria

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Conditions

The condition(s) this trial relates to.

adjustment disorder

As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

Adaptation reaction Aerobic capacity Altitude training adaptation Athletic performance Exercise-induced inflammation Neuromuscular performance Physical endurance

Contacts and locations

Locations

  • Sport Sciences Department, University of Sistan and Baluchestan

    Zahedan, Sistan and Baluchestan, 98135-986, Iran

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