Dr. Craig Heller

So we've actually had experiences where we've had people exercising, getting overheated, and then cooling the body surface.

And they say, it feels great.

This is fantastic.

And their core temperature is going up.

So what can happen if you, let's say, cool the torso with an ice vest, you can actually cause vasoconstriction of your portals, your heat loss portals.

So that's what impairs the rate at which you're losing heat.

It feels good.

Now, back to the head.

That's really interesting.

The major blood flow to the brain comes up four arteries through the neck.

There's the carotid arteries and there's the vertebral arteries.

So when you put a cold towel around the neck, you're going to be putting a cold stimulus into the brain.

Well, that's great for protecting the brain.

You want to protect the brain, but it's also going to make you feel cooler than you are.

So you will think you're ready to go again quickly when you've just essentially cooled the thermostat.

Well, if they stop the cooling, then that hot blood from the body core is going to go to the brain.

Interesting.

Yeah, you can feel great and have a dangerously hyperthermic temperature.

But I should say that when you get into the danger zone, things get bad fast.

What are some of the symptoms that people could be on the lookout for, for hyperthermia?