oxygen breathing during heat exposure maintains brain oxygenation despite reduced blood flow
During passive hyperthermia, cerebral oxygenation is maintained despite large reductions in cerebral blood flow velocity (~30–45%), suggesting enhanced oxygen extraction from blood as a compensatory mechanism to preserve cerebral oxygen delivery.
What this means for you
Even as blood flow to the brain naturally decreases during whole-body heat exposure, your brain appears to compensate by extracting more oxygen from the blood already there — keeping cerebral oxygen levels stable. For most people, this translates to mental clarity and alertness being preserved rather than feeling foggy or lightheaded during a warming session.
The published research
Human cardiorespiratory and cerebrovascular function during severe passive hyperthermia: effects of mild hypohydration.
Journal of applied physiology (Bethesda, Md. : 1985) · 2008
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