Could a sweaty workout rewire your immune system?
NCT ID NCT07771075
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.
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Study facts
What this study's own registry entry says, in plain language.
- Phase
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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
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80 people
The number who actually took part.
- Started
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Jan 2026
- Finished
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Jul 2026
- Lead sponsor
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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
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18 to 30 years
- Sex
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Anyone
- Healthy volunteers
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Accepted
You do not need to have the condition being studied to take part.
Show the full entry requirements Hide 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.
As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.
Contacts and locations
Locations
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Exercise Physiology Laboratory, College of Physical Education and Sports Sciences, University of Samarra
Samarra, Muhafazat Salah ad Din, Iraq
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