You might say they simply run out of sweat. Skin gets hot, red, and dry. They lapse into a coma and, if untreated, die. But more and more people are being killed of the second variety, exertional heat stroke. The victim is usually young, fit, and unaccustomed to heat, sweating but producing heat faster than it can be shed.
Skin is hot and red, but wet with sweat.
Rapid breathing and rapid heart rates are almost universal. Collapse is imminent. Quick cooling may be required to saver this victim's life, and the best method includes removal of clothing, covering with wet cotton, and vigorously fanning, all of which increases evaporative heat loss. Massaging of arms and legs and ice packs at the neck, groin, and armpits increase heat loss. Throwing patients into cold water is less effective and often dangerous since they are difficult to manage and may drown.