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Quick soak, big chill? study tests 5-Minute hot baths for heat acclimation

NCT ID NCT07198334

Knowledge-focused Sponsor: Lithuanian Sports University Source: ClinicalTrials.gov ↗

What the study statuses mean

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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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 tested whether taking a daily 5-minute bath in hot water (45°C) for two weeks could help healthy young adults adapt to heat. Researchers measured changes in body temperature, heart rate, and other signs of heat stress in 26 participants. The goal was to see if such a short, convenient routine could trigger the body's natural heat acclimation, potentially offering a time-saving alternative to longer heat exposure methods.

What this could mean

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

Active substance
Passive heat acclimation via whole-body immersion in 45°C water
What this could lead to
If successful, this could offer a quick and easy way for people to get used to hot environments, potentially benefiting athletes or workers in hot conditions.
What could go wrong
This is a small, early-stage study with only 26 healthy participants. The brief heat exposure may not produce lasting or meaningful heat adaptation, and results may not apply to older or less healthy individuals.

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

26 people

The number who actually took part.

Started

Oct 2020

Finished

May 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.

Ages

18 to 35 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: * Healthy, non-obese males and females aged 18 to 35 years with a body mass index between 18.5 and 29.9 kg/m². * No participation in temperature manipulation programs (e.g., cold or heat acclimation) within the past three months. * No engagement in excessive formal exercise. * Female participants must have a regular menstrual cycle. Exclusion Criteria: * Current smokers. * Fear of needles or blood. * Use of medications or supplements that could affect study outcomes. * History of neurological, cardiovascular, metabolic, or inflammatory diseases that could be aggravated by hot water exposure.

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As listed by the trial registrant

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

Healthy participants

Contacts and locations

Locations

  • Lithuanian Sports University

    Kaunas, Lithuania

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