Flight Safety

Originally published in 2000

Dehydration and the Pilot: 3 Stages of Heat Exhaustion

Transition from the one to the other can be very evident, hardly noticeable, or not evident at all.

Heat stress (body temperature, 99.5 – 100 F) reduces:
Performance, dexterity, and coordination
Ability to make quick decisions
Alertness
Visual capabilities
Caution and caring

Heat exhaustion (101 – 105 F) symptoms:
Fatigue
Nausea/vomiting
Giddiness
Cramps
Rapid breathing
Fainting

Heat stroke (> 100 F) symptoms:
Body’s heat control mechanism stops working
Mental confusion
Disorientation
Bizarre behavior
Coma

Source: FAA Aviation News