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• W2025723948 abstract "Purpose: Orthostatic stability on Earth is maintained through sympathetic nerve activation sufficient to increase peripheral vascular resistance and defend against reductions of blood pressure. Orthostatic instability in astronauts upon return from space missions has been linked to blunted vascular resistance responses to standing, introducing the possibility that spaceflight alters normal function between sympathetic efferent traffic and vascular reactivity.Methods: We evaluated published results of spaceflight and relevant ground-based microgravity simulations in an effort to determine responses of the sympathetic nervous system and consequences for orthostatic stability.Results: Direct microneurographic recordings from humans in space revealed that sympathetic nerve activity is increased and preserved in the upright posture after return to Earth (STS-90). However, none of the astronauts studied during STS-90 presented with presyncope postflight, leaving unanswered the question of whether postflight orthostatic intolerance is associated with blunted sympathetic nerve responses or inadequate translation into vascular resistance.Conclusions: There is little evidence to support the concept that spaceflight induces fundamental sympathetic neuroplasticity. The available data seem to support the hypothesis that regardless of whether or not sympathetic traffic is altered during flight, astronauts return with reduced blood volumes and consequent heightened baseline sympathetic activity. Because of this, the ability to withstand an orthostatic challenge postflight is directly proportional to an astronaut's maximal sympathetic activation capacity and remaining sympathetic reserve." @default.
• W2025723948 created "2016-06-24" @default.
• W2025723948 creator A5023636382 @default.
• W2025723948 creator A5089261354 @default.
• W2025723948 date "2007-02-01" @default.
• W2025723948 modified "2023-09-27" @default.
• W2025723948 title "Sympathetic nervous system and spaceflight" @default.
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• W2025723948 doi "https://doi.org/10.1016/j.actaastro.2006.08.003" @default.
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