Could a sweaty workout rewire your immune system?

NCT ID NCT07771075

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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 Aug 18, 2026 · Last updated Aug 19, 2026 · Updated 1 time

Summary

This trial asks whether short bursts of intense exercise can leave a lasting mark on immune cells, making them respond more strongly to threats. Eighty healthy but inactive adults aged 18-30 are randomly assigned to six weeks of high-intensity interval training, moderate continuous cycling, or no training, followed by a rest period and a final exercise challenge. Researchers measure changes in immune cell activity and chemical markers to see if intense exercise produces a persistent 'trained immunity' effect.

What this could mean

Our plain-language read of the trial. This is informational only, not medical advice or a prediction.

Active substance
High-Intensity Interval Training (HIIT) and Moderate-Intensity Continuous Training (MCT) as behavioral exercise interventions
What this could lead to
If intense exercise leaves a lasting imprint on immune cells, it could point toward ways to boost immune readiness through exercise.
What could go wrong
This is a small, early-stage study in healthy young adults, so results may not apply broadly. The effects may be short-lived or not translate into real-world health benefits.

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

80 people

The number who actually took part.

Started

Jan 2026

Finished

Jul 2026

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

18 to 30 years

Sex

Anyone

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 Men and women aged 18-30 years. Healthy adults. Physically inactive, defined as participating in less than 150 minutes per week of structured moderate-to-vigorous exercise during the preceding 6 months. Exclusion Criteria: * Major cardiovascular, metabolic, respiratory, renal, endocrine, inflammatory, autoimmune, or hematological disease. Current tobacco use. Current use of relevant immunomodulatory, anti-inflammatory, corticosteroid, or cardiovascular medications. Acute infection within 4 weeks before baseline assessment. Musculoskeletal contraindications to maximal cycling exercise. Pregnancy or lactation.

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Conditions

The condition(s) this trial relates to.

Sedentary Behavior

As listed by the trial registrant

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

Contacts and locations

Locations

  • Exercise Physiology Laboratory, College of Physical Education and Sports Sciences, University of Samarra

    Samarra, Muhafazat Salah ad Din, Iraq

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