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Brain structure and neurocognitive function in two professional mountaineers during 35 days of severe normobaric hypoxia.

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Title: Brain structure and neurocognitive function in two professional mountaineers during 35 days of severe normobaric hypoxia.
Authors: Sönksen, Sven‐Erik (AUTHOR), Kühn, Sven (AUTHOR), Basner, Mathias (AUTHOR), Gerlach, Darius (AUTHOR), Hoffmann, Fabian (AUTHOR), Mühl, Christian (AUTHOR), Tank, Jens (AUTHOR), Noblé, Hans‐Jürgen (AUTHOR), Akgün, Katja (AUTHOR), Ziemssen, Tjalf (AUTHOR), Jordan, Jens (AUTHOR), Limper, Ulrich (AUTHOR)
Source: European Journal of Neurology. Oct2022, Vol. 29 Issue 10, p3112-3116. 5p.
Subjects: Brain anatomy, Hypoxemia, Mountaineers, White matter (Nerve tissue), Magnetic resonance imaging
Abstract: Background and purpose: Animal studies suggest that exposure to severe ambient hypoxia for several days may have beneficial long‐term effects on neurodegenerative diseases. Because, the acute risks of exposing human beings to prolonged severe hypoxia on brain structure and function are uncertain, we conducted a pilot study in healthy persons. Methods: We included two professional mountaineers (participants A and B) in a 35‐day study comprising an acclimatization period and 14 consecutive days with oxygen concentrations between 8% and 8.8%. They underwent cerebral magnetic resonance imaging at seven time points and a cognitive test battery covering a spectrum of cognitive domains at 27 time points. We analysed blood neuron specific enolase and neurofilament light chain levels before, during, and after hypoxia. Results: In hypoxia, white matter volumes increased (maximum: A, 4.3% ± 0.9%; B, 4.5% ± 1.9%) whilst gray matter volumes (A, −1.5% ± 0.8%; B, −2.5% ± 0.9%) and cerebrospinal fluid volumes (A, −2.7% ± 2.4%; B, −5.9% ± 8.2%) decreased. Furthermore, the number (A, 11–17; B, 26–126) and volumes (A, 140%; B, 285%) of white matter hyperintensities increased in hypoxia but had returned to baseline after a 3.5‐month recovery phase. Diffusion weighted imaging of the white matter indicated cytotoxic edema formation. We did not observe changes in cognitive performance or biochemical brain injury markers. Discussion: In highly selected healthy individuals, severe sustained normobaric hypoxia over 2 weeks elicited reversible changes in brain morphology without clinically relevant changes in cognitive function or brain injury markers. The finding may pave the way for future translational studies assessing the therapeutic potential of hypoxia in neurodegenerative diseases. [ABSTRACT FROM AUTHOR]
Copyright of European Journal of Neurology is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Psychology and Behavioral Sciences Collection
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  Data: Brain structure and neurocognitive function in two professional mountaineers during 35 days of severe normobaric hypoxia.
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  Data: <searchLink fieldCode="JN" term="%22European+Journal+of+Neurology%22">European Journal of Neurology</searchLink>. Oct2022, Vol. 29 Issue 10, p3112-3116. 5p.
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  Data: Background and purpose: Animal studies suggest that exposure to severe ambient hypoxia for several days may have beneficial long‐term effects on neurodegenerative diseases. Because, the acute risks of exposing human beings to prolonged severe hypoxia on brain structure and function are uncertain, we conducted a pilot study in healthy persons. Methods: We included two professional mountaineers (participants A and B) in a 35‐day study comprising an acclimatization period and 14 consecutive days with oxygen concentrations between 8% and 8.8%. They underwent cerebral magnetic resonance imaging at seven time points and a cognitive test battery covering a spectrum of cognitive domains at 27 time points. We analysed blood neuron specific enolase and neurofilament light chain levels before, during, and after hypoxia. Results: In hypoxia, white matter volumes increased (maximum: A, 4.3% ± 0.9%; B, 4.5% ± 1.9%) whilst gray matter volumes (A, −1.5% ± 0.8%; B, −2.5% ± 0.9%) and cerebrospinal fluid volumes (A, −2.7% ± 2.4%; B, −5.9% ± 8.2%) decreased. Furthermore, the number (A, 11–17; B, 26–126) and volumes (A, 140%; B, 285%) of white matter hyperintensities increased in hypoxia but had returned to baseline after a 3.5‐month recovery phase. Diffusion weighted imaging of the white matter indicated cytotoxic edema formation. We did not observe changes in cognitive performance or biochemical brain injury markers. Discussion: In highly selected healthy individuals, severe sustained normobaric hypoxia over 2 weeks elicited reversible changes in brain morphology without clinically relevant changes in cognitive function or brain injury markers. The finding may pave the way for future translational studies assessing the therapeutic potential of hypoxia in neurodegenerative diseases. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of European Journal of Neurology is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1111/ene.15470
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      – SubjectFull: Brain anatomy
        Type: general
      – SubjectFull: Hypoxemia
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      – SubjectFull: Mountaineers
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