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2022-0 1- 17 20:50

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Astronauts will have muscle atrophy, heart atrophy, osteoporosis, increased intracranial pressure, decreased vision, immune system disorder and other problems after flying in space, and their health will be extremely weak!

Get to know astronauts briefly.

Astronauts who take space flight as their profession are also called astronauts. They not only have to experience life in space, but also complete various scientific experiments in space, and they are pioneers of human exploration of the universe.

Aerospace is a special occupation, with special working environment, complex working skills and heavy work content. In this case, astronauts must go through many tests before they can take up their posts. When selecting astronauts, all countries have also carried out the most rigorous selection.

To become an astronaut, the first condition is to have more than 1000 hours of flying experience, the second is to have strong physical and psychological qualities, and finally to pass the "technical test" of the special facilities in the space city.

In short, any astronaut in the world has a healthy body, but how can their bodies become weak after space flight?

Physical changes of astronauts after space flight.

One: the body will grow taller.

20 17 12 17 Russian Soyuz spacecraft made its first space trip at Baikonur Space Base in Kazakhstan, and its destination was the International Space Station.

On 17, 12 and 19, Kimai Xuanmao successfully arrived at the International Space Station, and then began to work and live in space. He stayed in space for more than five months and didn't return to earth until June 3, 20 18. During his work, Jin Jing Xuanmao performed well, but there was an oolong incident.

2018 65438+1October 9, Kimi Hiroshi was still in the space station. On the same day, he posted on his Twitter that he had grown 9 cm after only three weeks in space.

When tweeting, Jin Mao used three surprises to express his surprise. As for the surprise, he is still a little worried that when he grows taller, the original space chair can't hold him and he can't return to Earth safely.

When the news came out, it immediately attracted the attention of the whole world. No matter scientists or ordinary people, they are full of curiosity about the three-circumference and nine-centimeter height, and they also feel incredible. Just as scientists were preparing to study the mystery, Kanai Xuanmao spoke again.

On 2018,65438+10,10, Kani Xuanmao sent a message again, saying that his measurement was wrong, not 9 cm long, only 2 cm, and his current height was 182 cm, and he apologized for his recklessness.

In fact, it is normal for astronauts to grow 2-5 cm tall in space. This is because people are under great pressure on the earth, and their bones and spine can't stretch out. But in space, under the influence of microgravity, astronauts are in a state of weightlessness, all the pressure on their bodies is released, the spine is stretched, the gap between bones becomes larger, and people will increase accordingly.

Unfortunately, this growth is not permanent. After the astronauts return to the earth, gravity will press on them again, and their bones and spines will return to their original state, and their height will also return to its original state.

Two: muscle atrophy

The research team of MIT found a problem after the physical examination of 17 astronauts who had worked in the International Space Station. Astronauts who have been in the space station for half a year on average have a certain degree of muscle atrophy, especially back muscle atrophy.

In addition, scientists also found that the astronauts' muscles shrank, while their body fat was increasing. After returning to Earth for one year, the muscle atrophy recovered.

Muscles in different parts have different degrees of atrophy, ranging from 4.6% to 8.8%. From the data alone, muscle atrophy does not seem to be very serious, but we must know that astronauts have only stayed in space for half a year, and their muscles have decreased by one twentieth or even one tenth. If astronauts live in space for 10 years, will there be no muscle left?

Muscle atrophy of astronauts is a major problem in the aerospace industry.

On the earth, under the action of gravity, astronauts are in motion even when they walk normally, but space has always been in a weightless environment. Astronauts have no weight in space, they have been suspended in the air, and their muscles are in a relaxed state, so they will contract rapidly.

In order to solve this problem, scientists have added a lot of fitness equipment in the space station, such as space tensioners, space treadmills and space bicycles. Astronauts need to exercise their muscles through exercise and fitness after work to avoid muscle atrophy, but space is not the earth after all, and even training can only slow down the speed of muscle atrophy and cannot be completely avoided.

Three: heart atrophy

From March 27th, 20 15 to March 27th, 20 16, astronaut scott kelly lived in space for 340 days. After returning to Earth, scientists from UT Southwest University made a detailed study of scott kelly's body.

It is found that during scott kelly's 340 years in space, his heart and left ventricle lost an average of 0.74g per week. In other words, his heart has shrunk. The good news is that scott kelly is very strong. Even though his heart contracted a little, there was nothing wrong with his body, and his heart function was still very good.

After that, scientists examined the heart structure and function of 13 astronauts who spent six months on the International Space Station, and found that different people have different adaptability to space. Some people's hearts have obviously shrunk, while some astronauts' hearts have not.

In fact, the heart itself is also a muscle. In the weightless environment in space, it will also be in a relaxed state, and it is normal to contract. But if astronauts live in space for a long time and their hearts shrink to a certain extent, there will be big problems.

Four: osteoporosis

Muscle atrophy can be seen, but osteoporosis is hard to find.

In space, astronauts have been in weightlessness, standing and walking effortlessly, and they look very comfortable. In fact, this is not a good thing for their health.

On the earth, the body has been in a state of heavy load, and walking can produce bone effect, but once this environmental influence is lost, astronauts' bones will be quickly lost, which will lead to osteoporosis.

Let's take a look at the astronauts in China. Nie Haisheng is 57, Liu Boming is 55 and Tang Hongbo is 46. All three are old and belong to the age of bone loss. Coupled with the influence of space environment, bone loss is faster. After living in space for several months, the skeleton is like an old man, very fragile.

Therefore, astronauts in space can't avoid the problem of osteoporosis. Coupled with muscle atrophy, wearing a spacesuit weighing dozens of pounds, you will feel weak after returning to earth, and your legs will be weak and you can't stand up.

So the astronauts we saw, when they first returned to the earth, were all in wheelchairs or supported by people and could not stand on their own.

Five: increased intracranial pressure and decreased vision.

In the human body structure, the head is at the highest place in the human body, and the pressure of oxygen or blood on the head is minimal. When people stand upside down, there will be obvious discomfort in their heads, which is the result of excessive pressure.

Under the influence of zero gravity in space, excessive head pressure will increase cerebrospinal fluid, shrink brain space and even be squeezed.

After increased intracranial pressure, it will not only affect astronauts' judgment ability, but also have a chain reaction, leading to visual impairment intracranial pressure syndrome, eyeball compression, from spherical deformation to ellipse, and decreased vision.

Write at the end:

On the surface, astronauts are physically strong, but in fact, after flying in space, their bodies have been greatly affected and become extremely fragile, which requires long-term rehabilitation training to recover.

Don't astronauts know that heaven will do harm to their bodies? They naturally know that even so, they still have no hesitation. This is the spirit of astronauts. They are not only for their own country, but also for all mankind!

Every astronaut is an admirable hero.