Circulatory strain from loss of fluid and electrolyte imbalance
Factors:
Sweat-induced dehydration reduces blood volume
Fatigue, profuse sweating, nausea, vomiting, headache, lightheadedness, fainting, rapid pulse
Prevention & Treatment:
Move to cool environment
Lie down rest, elevated feet 8 – 12 inches above head
Replace salt and fluids (slowly)
Acclimatization, frequent fluids (with electrolytes)