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Coffee or tea? study tests which drink helps your heart while you sit

NCT ID NCT07159152

Symptom relief Sponsor: King Saud 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 This study
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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 26, 2026 · Last updated Jun 26, 2026

Summary

This study looks at how drinking coffee or hibiscus tea affects blood pressure and heart rate during long periods of sitting. Thirty healthy adults (15 men, 15 women) will try both drinks on different days. Researchers will measure their heart health before and after sitting for three hours.

What this could mean

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

Active substance
Coffee and hibiscus tea
What this could lead to
If it works, this could help people choose better beverages during long sitting to support heart health.
What could go wrong
This is a small, early-stage study with only 30 healthy young adults, so results may not apply to everyone. It's not testing a treatment for high blood pressure.

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 30 people

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

Expected to start

Sep 2025

An estimate. Start dates often move.

Expected to finish

Mar 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 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: * Age between 18 and 35 years. * Normal to elevated blood pressure (systolic \<130 mmHg and diastolic \<80 mmHg) and normal resting heart rate (60-100 bpm), ensuring selection of healthy adults and minimizing confounding factors. * Generally healthy, without chronic or acute medical conditions, to reduce external influences on study outcomes. * Physically inactive, not meeting current physical activity guidelines, as the study targets sedentary individuals. Exclusion Criteria: * Known allergy or hypersensitivity to hibiscus or coffee, as participants will consume these beverages during the study. * Current use of medications that could influence blood pressure, heart rate, or heart rate variability, including antihypertensive, chronotropic, or vasoactive drugs. * Any medical condition or health issue that may interfere with safe participation or affect study measurements.

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Conditions

The condition(s) this trial relates to.

hypertensive disorder Sedentary Behavior

As listed by the trial registrant

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

Hypertension

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

  • Princess Nourah University Lifestyle Center

    Riyadh, 80200, Saudi Arabia

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