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so joining me now here in mission

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control houston dr hans christian gunga

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he's one of the principal investigators

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for the circadian rhythm study uh it's

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taking place right now as we speak

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onboard the international space station

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japanese astronaut koichi wakata is

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engaged in it

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dr goonga thanks so much for being here

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today really appreciate it and first

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start me off real quick what is what is

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this circadian rhythm study why is you

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know why why are we doing it on board

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the international space station

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um actually this is a very important

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question because the the astronauts they

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they do not have a real

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day there they have several days and

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sunsets and such and so there there is

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over the millions of years we have

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developed

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the organism has adapted to this sunset

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and sundown so you have an internal

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rhythm and this internal rhythm is very

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important for your capabilities for your

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will

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vigor lens for all the things you are

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doing whether you sleep or not sleep

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and so if that rhythm is destroyed by

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having every day

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several times sunsets and sunlight

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sunsets some sunrise sun setting however

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yeah

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that's actually the case and that's why

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we

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introduced this study to uh analyze

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uh by measuring the core temperature

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that means the temperature in the body

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the temperature in the body is a signal

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for this circadian rhythm usually you

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usually have in the morning here on the

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ground between five and six am you have

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the lowest temperature that means in the

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in the body about

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36.5 and you have your highest

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temperature in the afternoon at 6 00 pm

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or so

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and this is about one day it sounds

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sounds less it's only one degree

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difference it's not a huge difference

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but no no it's measurable but it's

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measurable and it's it's a strong signal

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for the organism

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you you must realize that the the core

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temperatures is

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changing of metabolism and

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several other functions

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they

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are introduced by your internal rhythm

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which is coming from all the different

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or is organized from the different

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inputs and

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the core temperature is so to say the

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master of the orchestra of the different

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functions it's like an orchestra if you

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and you can expect if the the master of

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an orchestra is not ready

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and if it's uh uh working with different

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orchestras that is a real that's a mess

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can you i can mess you up okay well so

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and like i had mentioned koichi's

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participating in this right now on board

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the station you know what's he doing and

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see you have a device right yeah

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actually that is it's it's the same it's

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not exactly the same but it's the same

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measurement device and here you see this

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is the kind of sensor we are using for

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the measuring of the core temperature

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and usually you have to go with several

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probes into the rectum into the ear and

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so and that's not visible for them

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that's a little uncomfortable for you

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yeah that's very at least at least it's

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uncomfortable and but this is a new type

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of sensor it's actually not measuring

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the temperature

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but it is measuring the heat flux from

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for example he's placing that on your on

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your front and there's it fixed for 36

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hours and here inside you have two

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sensors

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and one sensor is measuring the heat

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coming from your front going to the

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first sensor and then going to a certain

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material and then coming to the next

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sensor and this heat flux

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represents in some way

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uh your body core temperature especially

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under kind of an indirect way of

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measuring right okay it's an indirect

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way

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which is um has to be transformed by

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certain algorithms to

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yeah to to get the core temperature

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profile that's all that's what we need

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all right and that's later on that is

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stored then on these devices and we get

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the data down

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several weeks later and we do these

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measurements not only on one time but in

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the in the early beginning

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and then every month at least so that we

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can see whether there is a change in

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this

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curve of the core temperature and we

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expect that

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the amplitude so to say how how uh the

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the delta between

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normally that is reduced

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due to certain facts okay well so what

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what are you guys really hoping to you

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know find out and almost

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solve so okay that's the the the the uh

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one of them is the main points we would

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like to look at

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when in the mission

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we have certain rhythms and whether you

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have the same rhythm as i have so it's

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not clear who is more disturbed by this

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kind of

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circadian rhythmic changes and the other

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so this gives you an example and gives

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you some hints about the

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capabilities of the different subjects

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and

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at least it it's important for our

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opinion for long to really long term

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space flights and we have to look at at

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methods and that

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technologies probably to keep

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that rhythm and that can be that can be

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done by by special lights or by by very

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structured meals or so very structured

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day then you have can have some inputs

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and uh we are working on that but that

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is that is so to say the terrestrial

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part there's also it is a

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space part we have so also a terrestrial

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because

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this this is now just in the last year

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we had several measurements in the

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german heart center for heart

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transplantation

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because these people they have not a

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high temperature they get very low their

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body temperature at 16 or 15 degrees so

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they are very very low to keep they are

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waiting for the heart and this device

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can be placed outside the the thorax

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and to to protocol their core

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temperature so very non-invasive very

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non-invasive it's easy to clean yeah and

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i think in in future you will hear much

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more about heat flux sensors in clinics

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for monitoring for example not only at

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big operations like like

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heart transfer but any kind of narcosis

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will shut down your possibilities to

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regulate your temperature yeah and so

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you probably after

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certainly you get hypothermic because

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the body do not react and this can be

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protocoled by this temperature and so

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there's a direct clinical application of

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this uh method which we designed for

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space so

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i mean that that really is an amazing

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you know earth example of just

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technology

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developed to find out why astronauts

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can't sleep and now it could do

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something i mean it's amazing how it can

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transfer we are very very

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we are very happy that this could be

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transferred to it and uh

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yeah looking forward about the results

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all right well again dr hans christian

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gungo one of the principal investigators

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for the circadian rhythm study uh thanks

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for you know coming on and telling us

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about it it's fascinating i i mean i

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hadn't even thought about temperature

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being used to you know regulate sleep

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cycles things like that i just learned

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something pretty amazing today so i