Cited by 149Spaceflight effects on biologyAdvanced Neuroimaging Techniques and ApplicationsAdvanced MRI Techniques and Applications

Spaceflight-Associated Brain White Matter Microstructural Changes and Intracranial Fluid Redistribution

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Lee, Jessica K., Koppelmans, Vincent, Riascos, Roy F., Hasan, Khader M., Pasternak, Ofer, Mulavara, Ajitkumar P., Bloomberg, Jacob J., Seidler, Rachael D.·2019·JAMA Neurology

Abstract

Importance: Spaceflight results in transient balance declines and brain morphologic changes; to our knowledge, the effect on brain white matter as measured by diffusion magnetic resonance imaging (dMRI), after correcting for extracellular fluid shifts, has not been examined. Objective: To map spaceflight-induced intracranial extracellular free water (FW) shifts and to evaluate changes in brain white matter diffusion measures in astronauts. Design, Setting and Participants: We performed retrospective, longitudinal analyses on dMRI data collected between 2010 and 2015. Of the 26 astronauts' dMRI scans released by the National Aeronautics and Space Administration Lifetime Surveillance of Astronaut Health, 15 had both preflight and postflight dMRI scans and were included in the final analyses. Data were analyzed between 2015 and 2018. Interventions or Exposures: Seven astronauts completed a space shuttle mission (≤30 days) and 8 completed a long-duration International Space Station mission (≤200 days). Main Outcomes and Measures: The dMRI scans were acquired for clinical monitoring; in this retrospective analysis, we analyzed brain FW and white matter diffusion metrics corrected for FW. We also obtained scores from computerized dynamic posturography tests of balance to assess brain-behavior associations. Results: Of the 15 astronauts included, the median (SD) age was 47.2 (1.5) years; 12 were men, and 3 were women. We found a significant, widespread increase in FW volume in the frontal, temporal, and occipital lobes from before spaceflight to after spaceflight. There was also a significant decrease in FW in the posterior aspect of the vertex. All FW changes were significant and ranged from approximately 2.5% to 4.0% across brain regions. We observed white matter changes in the right superior and inferior longitudinal fasciculi, the corticospinal tract, and cerebellar peduncles. All white matter changes were significant and ranged from approximately 0.75% to 1.25%. Spaceflight mission duration was associated with cerebellar white matter change, and white matter changes in the superior longitudinal fasciculus were associated with the balance changes seen in the astronauts from before spaceflight to after spaceflight. Conclusions and Relevance: Free water redistribution with spaceflight likely reflects headward fluid shifts occurring in microgravity as well as an upward shift of the brain within the skull. White matter changes were of a greater magnitude than those typically seen during the same period with healthy aging. Future, prospective assessments are required to better understand the recovery time and behavioral consequences of these brain changes.

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Authors
Lee, J. K., Koppelmans, V., Riascos, R. F., Hasan, K. M., Pasternak, O., Mulavara, A. P., Bloomberg, J. J., & Seidler, R. D.
Affiliations
  • University of Florida (US)
  • University of Utah (US)
  • The University of Texas Health Science Center at Houston (US)
  • Brigham and Women's Hospital (US)
  • Wyle (United States) (US)
  • National Aeronautics and Space Administration (US)
  • University of Florida Health (US)
Corresponding author
Seidler, Rachael D.
Venue
JAMA Neurology
Published
2019-04-01
Volume
76
Issue
4
Pages
412
ISSN
2168-6149 (ISSN-L)
OpenAlex
W2911843974
Cited by
149
References
55
Citations by year
2026: 15 · 2025: 19 · 2024: 19 · 2023: 16 · 2022: 25 · 2021: 18 · 2020: 23 · 2019: 14
FWCI
13.72
Type
journal article
Language
en
Open access
Locations
  • JAMA Neurology (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Aeronautics and Space Administration (NNX11AR02G)
  • National Space Biomedical Research Institute
  • National Institutes of Health
Topics
  • Health Sciences › Medicine › Physiology › Spaceflight effects on biology
  • Health Sciences › Medicine › Radiology, Nuclear Medicine and Imaging › Advanced Neuroimaging Techniques and Applications
  • Health Sciences › Medicine › Radiology, Nuclear Medicine and Imaging › Advanced MRI Techniques and Applications
Keywords
spaceflight, white matter microstructure, extracellular free water, microgravity, astronauts, diffusion MRI, balance disorders, posturography, superior longitudinal fasciculus, cerebellar white matter, International Space Station, Space Shuttle, brain-behavior relationship, healthy aging, microstructural changes
MeSH terms
Adult, Brain, Cerebellum, Postural Balance, Female, Humans, Male, Middle Aged, Pyramidal Tracts, Retrospective Studies, Space Flight, Time Factors, United States, Weightlessness, Case-Control Studies, Astronauts, Fluid Shifts, United States National Aeronautics and Space Administration, Diffusion Magnetic Resonance Imaging, Extracellular Fluid, White Matter

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