passive hyperthermia significantly alters heart, breathing, and brain blood flow responses
During severe passive hyperthermia, human cardiorespiratory and cerebrovascular function is significantly altered, with effects compounded by mild hypohydration.
What this means for you
When your core temperature rises during a heat session, your heart, lungs, and brain circulation all shift into a higher gear. This kind of cardiovascular and cerebrovascular activation is the same adaptive stress your body uses to build resilience — and staying well-hydrated beforehand helps your body handle that load more comfortably.
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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