So

up until now, I've been talking about whole body

heating. So, for instance, putting your whole body into the sauna, which of course, is what most people do or getting into a hot tub or hot bath up to your neck or

in the cases, where we were talking about deliberate cold exposure, as a means to increase core body, temperature and metabolism. Getting into an ice

bath or cold water of some sort up to your neck or into a cold shower, Etc. Now, I'd like to talk about deliberately heating or cooling specific parts of the body, meaning, certain

surface areas

of your body, as a means to get effects on those particular areas, as well as at the whole body level

numerous times throughout this episode. I've talked about the dangers of overheating. So what should you do? If you think you or someone else is hyperthermic, it's too hot. Well, if you understand just a Little bit about the cooling and heating systems of your shell and core. There are some terrific tools that you can use in order to cool

off your core quickly. And remember, the core consists of the nervous system, the spinal cord in the viscera, which are really the organs. You're trying to protect. So being able to cool off

the core of your body, quickly can be very beneficial

and in some cases. It could even save your life. There

is a way to more quickly, heat or cool, the body and that's through

specific elements of your shell meaning. A particular skin surfaces. I've talked extensively

about this in the episode on cold. It was also covered in the episode with my guest. Dr.

Craig Heller from the biology department at Stanford. It

relates to the so-called glabrous skin surfaces

on the upper half of our face

Palms of our hands and the bottoms of our feet. And for those of you that heard this before, I encourage you to continue to listen nonetheless because today I'm going to talk about specifically how to heat the body or cool. The body through

these glabrous skin surface. Very

briefly. The mechanism is as

follows. The palms of our hands, the bombs of our feet in the upper half of our face.

/ lie, specific types of

vasculature meaning

specific types of veins and

arteries that don't have capillaries between them. And as a consequence heat

and cold can move very quickly from the palms of the hands, the bottoms of the feet in the upper

half of our face and change our core body temperature. There's

a name for these particular vascular structures. They're called a VA s or arteriovenous. Anastomoses, basically. Eames and arteries, interacting directly without capillaries

in between, which

allows cooling of blood or heating of blood much more quickly than as possible,

by applying cold or heat Elsewhere on the body where capillaries intervene between veins and arteries. These

a VA s arteriovenous. Anastomoses can be leveraged to cool off your core body

temperature very quickly. The key thing is to get

the palms of your hands, the bottoms of your feet, and the upper half of your face in contact, with a cold surface. Or fluid that is cold enough to cool

the blood and the core of your body but

not so cold that it constricts, the veins

just below the palms of your hands, bottoms of your feet or the upper half of your face. So not placing ice packs necessarily,

but may be placing cool.

Towels on the bottoms of the feet, the palms of the hands and the upper half of the face and as they warm up, replacing those with other cool towels. The exact temperature will depend on how hot you happen to be. I can't. That without knowing your particular circumstances. If you'd like to

learn more about how to cool off your core very quickly, and some of the details and some of the technologies that are being developed to do that. Please see the episode

idea with Craig Heller or the episode on cold. If you don't

want to go to those episodes, here's a good procedure that you could use. You could grab, for instance, a package of frozen broccoli or frozen blueberries. If someone is really, really warm, make sure

they take off their shoes and socks, get their feet. On top of those ideally, get some into their hands, as well. Get some cool. Isis and get them onto people's face. You could,

of course, also put a cool compress on

the back of the neck, on the top of the head. That would be an especially good idea. If

someone were hyperthermic

because of the way that cooling of the brain occurs under conditions of hyperthermia, but

the key Point here is that just putting cold

compresses or cold materials onto. Somebody's torso is not going to be as efficient as cooling. Those glabrous skin surfaces the bottoms of the feet, the palms of the hands and the upper half of their face. Similarly or I supposed to be more accurate as Say