High air temperatures reduce the body's ability to use radiation to remove heat (the natural process of heat moving from hot to cool areas).
The body's capacity to expel heat through evaporation is decreased by high humidity (sweating). Even young, healthy individuals can become unwell when the two are combined.
Age, pre-existing medical disorders, and medications can all have a significant impact on how severely heat emergencies affect the body and how frequently they happen.
The body uses dilatation of the tiny arteries in the skin to transmit heat from the interior of the body to the surface during hyperthermia. Dehydration or ambient temperatures that are higher than the body's core temperature, however, foil this plan since convection, conduction, and radiation are no longer present.
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