Transient gray matter decline during antarctic isolation: Roles of sleep, exercise, and cognition
David Roalf1, Mathias Basner2, Joanne C Beer3
1Brain Behavior Laboratory, Department of Psychiatry, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA. roalf@pennmedicine.upenn.edu.
NPJ Microgravity
|July 11, 2025
Summary
Astronaut brain structure changes, including gray matter loss in key regions, were observed during a 12-month Antarctic mission. Better sleep may protect against these space-analog effects.
Area of Science:
- Neuroscience
- Space Medicine
- Psychology
Background:
- Spaceflight poses significant psychological and physiological stress.
- Understanding the neurobiological impact of isolation, confinement, and extreme (ICE) environments is crucial for astronaut health and mission success.
- Antarctic research stations serve as valuable analogues for long-duration space missions.
Purpose of the Study:
- To investigate structural brain changes in crewmembers during a 12-month deployment in an isolated, confined, and extreme (ICE) environment.
- To assess the reversibility of these brain changes after mission completion.
- To explore potential correlations between environmental factors (e.g., sleep quality) and observed brain alterations.
Main Methods:
- Magnetic Resonance Imaging (MRI) scans were performed on 25 crewmembers before, immediately after, and five months post-mission.
- A control group of 25 individuals and four 'flying phantom' individuals were scanned for comparison.
- Statistical analyses were used to compare brain structure metrics between groups and time points.
Main Results:
- Significant gray matter decreases were observed in the temporal and parietal lobes, hippocampus, pallidum, and thalamus during the mission.
- Global white matter volume also decreased.
- Most brain volume changes, except for the thalamus, returned to baseline levels five months after the mission. Brain ventricle volume increased.
- Improved sleep quality correlated with reduced brain volume loss.
Conclusions:
- Extended stays in isolated, confined, and extreme (ICE) environments induce measurable structural brain changes.
- These changes appear to be partially reversible, but the thalamus showed persistent alterations.
- Sleep quality may play a protective role in mitigating brain volume loss during such missions.
- Further research into the mechanisms underlying these neurobiological adaptations is essential for planning future long-duration space exploration.
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