No Sweat Operation Ouch!

Are you ready for our out-snips?

Snip!

Ouch!

Exactly!

It's hot versus cold.

We're putting

our bodies to the test

to see how they react

in extreme temperatures.

Behind this glass, it's colder than

the freezer in your kitchen.

It's actually colder than

the North Pole.

In fact, it's colder in here

than the coldest place on Earth.

That's Antarctica.

This is a cryogenic chamber

and I'm going to get inside.

And I've come to Loughborough

University to find out

what happens to the body

when you get hot.

I'm going to be running in a room

set to 50 degrees Celsius.

That's the same temperature

as the hottest place on Earth,

Death Valley!

Time to get changed.

Me too!

So, clearly, I'm going to need

a very warm coat to go in there?

No, just very, very small clothes.

Not very warm clothes.

This doesn't look like nearly

enough clothes.

I might be cold but at least

I'm going to look stylish.

Headband, vest, shorts,

two pairs of socks, clogs

face mask, gloves.

I told you I'd be looking good.

Er, if you say so, Xand!

A cryogenic chamber is normally used

to treat common health conditions

or help top athletes recover

from injury, but today I'm using it

to find out how our bodies

would react in extreme cold.

It's so cold in there

that our cameraman can't come in.

But I have my own special camera,

so you're coming with me.

Whoa!

OK...

..it's very cold

but it's quite manageable.

So the room I'm in at the moment is

as cold as the coldest temperature

ever recorded on Earth.

But this room is just

preparing my body for the next room,

which is twice as cold.

But first, Chris,

how are you getting on?

I've got to run on this treadmill

in this room,

which is kept at 50 degrees Celsius,

and I promise you

that is really hot.

If your bath was this hot you'd burn

yourself.

Off you go then.

This is causing my body temperature

to rise dramatically.

If it rose too high

it could be fatal,

but our bodies are amazing

at keeping us cool.

So I need to lose heat

and it's very hard to lose heat

when the air around you is hotter

than you need to be.

The only way you can

do it is by sweating.

# So hot in here. #

So the reason we sweat is to take

heat energy away from our bodies

and this helps to cool us down.

Your body also has some

clever tricks to keep you warm.

I'm moving into

the second room now

which is a chilling

minus 135 degrees!

That's far colder

than anywhere on Earth.

It's very hard to describe

quite how cold this is.

The closer I get to the floor...

This is now very, very, very, cold.

I'm getting goose bumps

all over my arm

and you can see every single hair

on my arm is standing straight up.

The reason that's happening is that

my body is trying to trap

a layer of air very close to my skin

and...I'm shaking a lot.

Shivering like this

is my body getting my muscles moving

to generate heat and keep me warm.

As my hand gets cold, you can see

all the blood goes out of my skin

and now my fingertips

are going absolutely white.

Very, very cold indeed.

That's because, as my body gets

colder, it's making a choice.

It's taking the blood away from the

parts of my body it can do without,

like my fingers and toes,

and putting it into the centre

of my body to keep vital organs

like my heart and brain alive.

Chris, how are you looking?

Um, sweaty!

The sweat Chris is producing

is not only full of salt,

there are other things

lurking in there too.

In fact, sweat is a lot like your

pee, it's a lot like urine,

so you can think about that

next time you're licking

it off your upper lip.

Gross!

And just like we've seen with Xand,

our body is clever at keeping

the most important areas safe

from changes in our temperature.

While I've been running,

the sweat experts have been

monitoring how much I've sweated.

So we've just measured me and I'm

a kilo lighter now than I was

at the beginning of my run and that

is that much sweat that I've made.

So we've shown you how your body

sweats away the extreme heat

to keep you cool.

And my body re-routed warm blood

away from my hands and feet

to look after the important

inner organs.

Our bodies are amazing.

See you next time.

Bye!

Bye!

Bye!

Bye!

Bye!

Bye.

By-y-y-e!

THEY MOUTH: Bye.