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Saturday, April 30, 2005

don't move

when the temperature in your study approches 95°F / 35°C during early morning hours, think about the following:

"The body's dominant forms of heat loss in a hot environment are radiation and evaporation. However, when air temperature exceeds 95°F / 35°C, radiation of heat from the body ceases and evaporation becomes the only means of heat loss. An individual exercising in the heat easily can sweat 1-2 L/h. If humidity reaches 100%, evaporation of sweat is no longer possible and the body loses its ability to dissipate heat."

Humidity is already 90% here.

Should we spend the rest of the day in bed, not excercising? Or evaporate outside only?

Inevitably and tragically, a wrong choice today will result in failure of renal and splanchnic vasoconstriction, cerebral edema, cerebrovascular congestion, a dramatic decrease in cerebral blood flow and finally, Central Nervous System Dysfunction:

"Initially, the body attempts to lower the core temperature via renal and splanchnic vasoconstriction with concomitant peripheral vasodilatation, thereby shunting blood to the periphery. Eventually, the vasoconstriction needed to keep the blood in the periphery fails; peripheral blood flow decreases, less heat is carried away from the core, and hyperthermia results. This hyperthermia causes cerebral edema and cerebrovascular congestion, which culminate in increased intracranial pressure. This increased ICP combined with a decreased mean arterial pressure (from the failure of renal and splanchnic vasoconstriction and decreased peripheral resistance) causes cerebral blood flow to decrease.

This is manifested clinically as Central Nervous System Dysfunction."