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Could a winter dip boost your blood? scientists investigate

NCT ID NCT06223087

Knowledge-focused Sponsor: University School of Physical Education, Krakow, Poland 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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 27, 2026 · Last updated Jun 27, 2026

Summary

This study looks at how regular winter swimming—bathing in cold open water during winter—affects blood cells, blood flow, and stress-fighting enzymes in healthy men. Researchers compare winter swimmers to a control group who never swim in cold water and have a sedentary lifestyle. Blood samples are taken before and after the winter swimming season to measure changes.

What this could mean

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

Active substance
winter swimming (cold water exposure)
What this could lead to
If beneficial changes are confirmed, this could point toward cold exposure as a simple, low-cost way to support blood health and antioxidant defenses.
What could go wrong
This is a small observational study with only 30 men, so results may not apply to women, older adults, or people with health conditions. It cannot prove cause and effect.

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.

Participants

30 people

The number who actually took part.

Started

Jan 2021

Finished

Dec 2024

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.

Who is studied

Experienced in winter swimming, regularly swimming in cold water (open water) at least once a week in the period November - March

Ages

25 to 60 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: * Good health, practitioners of winter swimming * control group: never did winter swimming and had a sedentary lifestyle. Exclusion Criteria: * medical contraindications to winter bathing

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Conditions

The condition(s) this trial relates to.

common cold Motor Activity

As listed by the trial registrant

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

Cold exposure

Contacts and locations

Locations

  • University of Physical Education

    Krakow, 31571, Poland

More trials for these conditions

Other studies related to the condition(s) this trial covers.