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‘Area complications’ are a literal ache for astronauts. Why do they occur?

March 23, 2024
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‘Area complications’ are a literal ache for astronauts. Why do they occur?
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Spaceflight generally is a actual headache — actually. For the reason that days of the Apollo program, astronauts have reported experiencing head ache throughout their stint in microgravity. And plenty of of them had by no means handled recurrent complications on Earth. Evidently one thing about space travel generally triggers migraine or rigidity headache–like signs, together with ache, sensitivity to mild and infrequently nausea.

Till lately, although, these experiences had been largely sporadic and anecdotal. Now a brand new examine, printed in Neurology on March 13, demonstrates that these mysterious “space headaches” are actually quite common. Researchers analyzed information from 24 astronauts who stored logs whereas on multi-week-long house expeditions, in addition to retrospective well being information from 42 astronauts who went on house missions previous to being studied. They discovered that inside the first seven days of leaving Earth, complications weren’t simply occasional inconveniences — they had been the norm. “Virtually each particular person [surveyed] in house suffered from a headache in that first week,” says Ron van Oosterhout, a neurologist at Leiden College Medical Middle within the Netherlands and co-author of the brand new paper.

This excessive prevalence made sense to the researchers; in spite of everything, when the human physique first enters microgravity, many unusual issues occur. Blood begins to pool within the torso and head, leading to facial swelling and generally visible impairments. The fluid within the interior ear that assist us hold our steadiness can also be disrupted by the shortage of gravity, resulting in a way of disorientation and movement illness.

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Astronauts sometimes adapt to those signs, and the discomfort begins to dissipate after a number of days in house. However that wasn’t the case with house complications. For 87% of the astronauts surveyed in house, the top ache continued to recur all through their mission, usually accompanied by sinus stress and congestion. And greater than half of the astronauts who had been surveyed after their return to Earth reported experiencing not less than one headache throughout their mission. Many members reported treating these signs by popping aspirin or different pain-relieving medication; others reported that sleep and train helped.

Whereas it is exhausting to make certain of the precise trigger, the researchers suspect that these complications come from elevated intracranial stress introduced on by the redistributed fluids within the astronaut’s physique. As gravity loosens its grip, blood, lymph and cerebrospinal fluid drift from their common places and start to exert stress elsewhere. If that is the reason for house complications, it could be in keeping with a identified house journey situation known as spaceflight-associated neuro-ocular syndrome, during which fluid urgent on the again of the attention impairs an astronaut’s imaginative and prescient.

an astronaut in a white spacesuit and gold helmet floats in space in a chair-like device

Bruce McCandless testing the Manned Maneuvering Unit (MMU) on the primary tetherless spacewalk in February 1984.  (Picture credit score: NASA)

And house complications may very well be much more frequent than the examine suggests. “One of many issues with evaluating complications is that they’re subjective, and [headache recall is] vulnerable to reporting bias,” says Alexandra Sinclair, a professor of neurology on the College of Birmingham in England, who was not concerned within the examine. Astronauts would possibly downplay the frequency and severity of their signs for concern of being grounded or seeming “weak,” for instance.

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Restricted pattern measurement additionally presents a problem. Ideally, the examine would have been in a position to collect information from a bigger variety of individuals, Sinclair says, “however that is virtually not possible in house analysis.” She notes that the researchers did a commendable job navigating these limitations and calls the paper “actually essential and fascinating.”

To get a greater thought of what causes these house complications, van Oosterhout and his group plan to check astronauts’ experiences with organic information, together with eye scans, mind scans and samples of blood, hair and urine. Finally, van Oosterhout hopes that the work will assist scientists deal with individuals’s complications a bit of nearer to dwelling as a result of individuals can get comparable rigidity complications on Earth.

“I actually just like the house analysis,” he says. “[But] on the identical time, I additionally really feel that every part we do must be achieved as a way to profit individuals on Earth.”

This text was first printed at Scientific American. © ScientificAmerican.com. All rights reserved. Observe on TikTok and Instagram, X and Facebook. 





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