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Can a cooling vest beat the heat? study tests simple solutions for outdoor workers

NCT ID NCT06998667

Symptom relief Sponsor: Stanford University 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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 tested two cooling methods to help outdoor workers lower their body temperature and avoid heat illness. 40 workers were monitored while using cooling vests or other cooling techniques. The goal was to see which method works best to keep core temperature down during hot workdays.

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

40 people

The number who actually took part.

Started

Jun 2025

Finished

Jan 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 years and older

Sex

Anyone

Healthy volunteers

Not accepted

This study is not open to healthy volunteers. The entry requirements below say who it is open to.

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: 1. Age ≥ 18 2. Anticipated to be working in the same job category for the duration of the study 3. Able to communicate in English or Spanish Exclusion Criteria: 1. Cannot provide informed consent 2. Weight less than 40 kg 3. Inability to swallow pills 4. Known history of having a pacemaker or ICD 5. Pregnancy as determined by self report and confirmed on Day 1 6. Gastrointestinal disorders (e.g., gastroparesis, prior surgery on GI tract with the exception of appendectomy or cholecystectomy, diverticulosis or inflammatory bowel disease) 7. Plan for an elective MRI in the 7 days post last planned pill ingestion

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Conditions

The condition(s) this trial relates to.

Heat Stress Disorders Hyperthermia

As listed by the trial registrant

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

Heat acclimation and thermotolerance Hyperthermia

Contacts and locations

Locations

  • Stanford University

    Palo Alto, California, 94304, United States

More trials for these conditions

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