During exertional heat stroke, the core temperature is typically:

• A. Below 34°C.
• B. Exactly 36°C.
• C. 39°C.
• D. Core temperature typically above 40°C during physical exertion.

Answer: (D)

Exertional heat stroke happens when intense exercise produces more heat than the body can shed, so body heat rises rapidly and the brain and other organs start to malfunction. The defining danger is a very high core temperature, typically above 40°C, and this level is often reached quickly if cooling isn’t started. That’s why “above 40°C during physical exertion” is the best description—the threshold reflects the point at which heat-related brain dysfunction and organ stress become evident. Temperatures well below that threshold don’t indicate heat stroke, and while 39°C is very high, it doesn’t meet the classic diagnostic cutoff for exertional heat stroke.