Chilled or warm? study tests if water temperature sharpens the mind
NCT ID NCT07654270
First seen Jun 27, 2026 · Last updated Jun 27, 2026
Summary
This study explores whether drinking cold or warm water changes heart rate and mental performance in healthy young women. Participants complete thinking tests after drinking water at different temperatures. The goal is to see if a simple factor like water temperature can influence focus and stress resilience.
What this could mean
Our plain-language read of the trial. This is informational only, not medical advice or a prediction.
- Active substance
- water at different temperatures
- What this could lead to
- If water temperature measurably affects mental performance, this could point toward simple ways to boost focus or reduce stress.
- What could go wrong
- This is a small, early-stage study in healthy young women only, so results may not apply to other groups or real-world settings.
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
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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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About 30 people
The number the study aims to enrol. It can still change while the study runs.
- Expected to start
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Jul 2026
An estimate. Start dates often move.
- Expected to finish
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Jun 2027
An estimate. End dates often move.
- 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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Female participants only
- 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 Criteria: * Healthy women free of chronic disease (by self-report) * 18-30 years of age Exclusion Criteria: * medication/drug use that has not been consistent for the previous 3 months or will be discontinued during the trial * any acute illness * regular use of cigarettes or marijuana * pregnant or lactating women * not fluent in English * not willing to attend two in-person lab visits in downtown Phoenix and follow study protocol (including abstaining from caffeine in the 12 hours prior to testing) * not currently competing in sports or unusually high-intensity exercise protocols (e.g., high-intensity exercise greater than 30 minutes most days of the week)
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As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.
How to take part
Only the study team decides who joins. These are the ways to reach them.
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The official record
ClinicalTrials.gov lists the study team's own contact details, including names and phone numbers. We don't republish those.
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A doctor treating you
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