Scientists try to peek at blood flow in zero gravity
NCT ID NCT03561545
First seen Mar 24, 2026 · Last updated Jun 20, 2026 · Updated 14 times
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.
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Summaries may miss details or leave out important information. Before applying or accepting participation, make sure you have read and understood the full study. Curemydisease.com takes no responsibility whatsoever for anything missed, misunderstood, or acted upon as a result of our summary — we know it does not capture everything.
This is a summary of the original study . Summaries may miss details or leave out important information. Before applying or accepting participation, make sure you have read and understood the full study. Curemydisease.com takes no responsibility whatsoever for anything missed, misunderstood, or acted upon as a result of our summary — we know it does not capture everything.
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Contacts and locations
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Locations
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Caen University Hospital
Caen, France
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.
As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.