Final Part 1: astronauts Flashcards
(37 cards)
What is bedrest used for?
Recovery (after an injury)
What does bedrest decrease
Blood flow AND glucose in the brain
Is bed rest good for you?
Long duration, it is actually bad for you
What is one of the most prestigious scientific journals?
The Lancet
What does 6 months in space change to your cardiovascular health
Your cardiovascular health increased in age of 20 years
What is bedrest an accelerated model of
Aging
Can you be sitting down, for something to be considered a ‘‘bedrest’’
No, you need to be laying completely flat
If bedrest is bad why are we still using it?
To understand what is happening in the body as we age
Why do astronauts age faster than regular people?
The decrease in gravity means that they don’t need to contract their muscles as much or at all.
How long does it take to regain the muscle mass loss after 14 days of bedrest
at least a year
Within 5-10 days of bedrest, what percent of your muscle strength do you loose
10-14%
After how many days does your body adapt to bedrest and your muscle atrophy remains stable
40 days
If you want to increase your venous return what muscle should you contract?
Calf (calve pumps)
What percentage of blood is lost by astronauts
20%
What does a decrease in blood volume lead to
Decrease in O2 to the brain and other regions
Why do astronaut loose blood?
Blood is concentrated at the top of the heart which sends a message to the brain to evacuate blood volume through pee.
How fast do astronaut loose their blood volume
In the first 24-48h
What simulation reflects the astronauts lost of blood volume on earth?
6 degree head tilt
How much blood volume is lost during the 6 degree head tilt
14%
In 3 months how much lean mass is lost by astronauts
2-4%
In 3 months, how much fat mass is gained by astronauts
4.5-8%
As we age what do we loose
Bone density
What is the average age of astronauts
48
What factor on earth help us not loose as much bone density
Mechanical stress of gravity
