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Do men and Women's blood vessels react differently to low oxygen? a study investigates

NCT ID NCT05219799

Knowledge-focused Sponsor: University of Missouri-Columbia 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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 Jul 28, 2026 · Last updated Jul 29, 2026 · Updated 1 time

Summary

This study examines whether sex and obesity influence how blood vessels widen in response to low oxygen levels. Researchers will infuse several drugs into the forearm artery of 72 healthy volunteers to block or stimulate specific nerve signals, measuring changes in blood flow. The goal is to uncover key mechanisms behind sex differences in vascular function, which may inform future treatments for obesity-related health issues.

What this could mean

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

Active substance
Propranolol, isoproterenol, phentolamine, and norepinephrine infused into the forearm artery
What this could lead to
If successful, this could help explain why men and women differ in blood vessel responses during low oxygen, potentially guiding future treatments for conditions like obesity-related vascular problems.
What could go wrong
This is an early-phase, small study (72 participants) focused on basic mechanisms, not a treatment trial. Results may not translate to real-world health outcomes.

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

Early phase 1

The earliest testing in people: a first look at safety, in a very small group.

Participants

About 72 people

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

Started

Mar 2023

Expected to finish

Jul 2027

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 45 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: * BMI \>18 kg/m2 Exclusion Criteria: * Pregnancy, breastfeeding * Diagnosed sleep apnea or AHI \>10 events/hr * Current smoking/Nicotine use * Increased risk of bleeding, pro-coagulant disorders, clotting disorders, anticoagulation therapy * Nerve/neurologic disease * Cardiovascular, hepatic, renal, respiratory disease * Blood pressure ≥140/90 mmHg * Diabetes, Polycystic ovarian syndrome * Communication barriers * Prescription medications, Sensitivity to lidocaine

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Conditions

The condition(s) this trial relates to.

Aneurysm Obesity obesity disorder

As listed by the trial registrant

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

Healthy Obesity Vasodilation

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

  • University of Missouri

    RECRUITING

    Columbia, Missouri, 65211, United States

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