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Scientists dive into how cold water shapes your decisions

NCT ID NCT06908447

Knowledge-focused Sponsor: German Institute of Human Nutrition Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now This study
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
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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 a brief full-body cold-water bath, compared to warm water, changes the way people make decisions, their mood, and body signals like heart rate and stress hormones. Forty healthy adults aged 18-40 will take part. The goal is to understand if cold exposure can influence risk-taking, food choices, and overall well-being.

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

About 40 people

The number the study aims to enrol. It can still change while the study runs.

Started

Aug 2025

Expected to finish

Dec 2026

An estimate. End dates often move.

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 40 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 Criteria: * 18-40 years of age * Consent to participate * Fluency in German * Physically and mentally healthy * BMI 18-30 kg/m2 * Normal day-night rhythm Exclusion Criteria: * Raynaud syndrome * Cold urticaria * High resting heart rate (\>160 beats per minute) * Acute infection * Diagnosed current or former illnesses of * Brain and mind * Heart and blood circulation * Gastrointestinal system * Endocrine system * Other serious past or present medical conditions * Wearing of medical devices (e.g., pacemaker) * Fear of blood, needles, or phlebotomy * Allergies to plasters, gels, and other medical equipment * Allergies to commercially available liquid meals (e.g., shakes, yfood Labs GmbH) * Recurrent intake of medication which affect metabolism * Regular nicotine consumption (e.g., vaping, cigarettes) * Excessive alcohol consumption (\>14 servings/week) * Recent illegal drug consumption (within 2 weeks prior) * Strong mental or physical stress * Excessive exercise (\>2 h high-intensity exercise/day) * Pregnancy or breastfeeding * Inability to wear skin-exposing swimwear, e.g., for religious reasons * Affinity for winter swimming, cryotherapy, breathwork (\>3 times/year)

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Conditions

The condition(s) this trial relates to.

Behavior

As listed by the trial registrant

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

Behavior Psychological wellbeing Quality of life Stress

How to take part

Only the study team decides who joins. These are the ways to reach them.

  1. The places running it

    1 site. The list below names each one and where it is.

  2. The official record

    ClinicalTrials.gov lists the study team's own contact details, including names and phone numbers. We don't republish those.

    Open the record ↗

  3. A doctor treating you

    A doctor who knows your case can contact a study site on your behalf, and can tell you whether this study is worth pursuing at all.

Contacts and locations

Locations

  • German Institute of Human Nutrition Potsdam-Rehbruecke

    RECRUITING

    Nuthetal, Germany

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