I think you're underselling it a bit. Our ancestral heritage gives us sweating. If that doesn't work, we sort of fall back to fight or flight, with a racing heart rate. move the blood around as much as you can, and hope some part of the body can cool it.
Heat stroke is a real thing, and it's not fun. There seems to be automatic systems you can't think your way out of that make things worse. Fast heartbeat is burning more calories, adding heat, and friction from viscous blood adding more heat. I imagine it's a pretty unpleasant feeling. I tend to go into shock, so I get to dodge most of that horrible sensation.
Rarely. Marathon training in summer, and being lazy about starting long runs early in the morning.
I'm pretty confident that I can say the incidence is not zero, but I'd agree it's less than 4.
this is over years. starting a multi hour run at 10 instead of 7 has some side effects. I'm not fast. I cover the distance. I've gotten into really weird headspace. I'm pretty good about tracking calories, so I'm pretty sure it was the heat from running when it's hot.
Heat stroke is a real thing, and it's not fun. There seems to be automatic systems you can't think your way out of that make things worse. Fast heartbeat is burning more calories, adding heat, and friction from viscous blood adding more heat. I imagine it's a pretty unpleasant feeling. I tend to go into shock, so I get to dodge most of that horrible sensation.