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Scientists try to peek at blood flow in zero gravity

NCT ID NCT03561545

Knowledge-focused Sponsor: University Hospital, Caen 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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 a non-invasive imaging technique can measure tiny blood vessels (microcirculation) during brief weightlessness on parabolic flights. Sixteen healthy volunteers were observed during 21-second periods of zero gravity. The goal was to understand how the cardiovascular system adapts to space and potentially develop a tool to monitor astronaut health.

What this could mean

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

What this could lead to
If successful, this could help develop a diagnostic tool to detect weightlessness-related cardiovascular issues and improve astronaut health monitoring.
What could go wrong
This is a small feasibility study with only 16 healthy volunteers, and the weightlessness periods last just 21 seconds, so results may not apply to longer space missions or real astronauts.

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

16 people

The number who actually took part.

Started

Sep 2017

Finished

Dec 2019

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 67 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 volunteers (men or women) * Aged from 18 to 67 * Affiliated to a Social Security system and, for non-French resident, holding a European Health Insurance Card (EHIC) * Who accepted to take part in the study * Who have given their written stated consent * Who have passed a medical examination similar to a standard aviation medical examination for private pilot aptitude (JAR FCL3 Class 2 medical examination). There will be no additional test performed for subject selection Exclusion Criteria: * Persons who took part in a previous biomedical research protocol, of which exclusion period is not terminated * Pregnant women (urine pregnancy test for women of childbearing potential)

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As listed by the trial registrant

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

Healthy volunteers

Contacts and locations

Locations

  • Caen University Hospital

    Caen, France

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