passive heat stress reduces cerebral blood flow velocity by ~25% despite higher cardiac output
Passive heat stress reduced middle cerebral artery mean blood velocity by ~25% and decreased internal carotid artery blood flow to 83% of baseline despite increased cardiac output, indicating cerebral hypoperfusion during hyperthermia.
What this means for you
During deep heat sessions, your brain actually receives less blood flow even as your heart pumps harder — a measurable shift in how your body prioritizes circulation under thermal stress. Understanding this response helps explain sensations like lightheadedness or mental calm that some people notice, and underscores why proper hydration and gradual exposure matter for a safe, comfortable experience.
The published research
Blood flow distribution during heat stress: cerebral and systemic blood flow.
Journal of cerebral blood flow and metabolism : official journal of the International Society of Cerebral Blood Flow and Metabolism · 2013
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