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Are you ready for our out-snips?
It's hot versus cold.
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.
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,
Time to get changed.
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
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.
..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
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...
HE SHUDDERS LOUDLY
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?
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.
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
Our bodies are amazing.
See you next time.
THEY MOUTH: Bye.