For human beings before, the distant and mysterious universe is a existence that can only be viewed from a distance and cannot be looked at closely, and with the rapid development of science and technology, the birth of more and more aerospace products has also made it possible for people to fly into space.
In order to explore the mysteries of the depths of the universe, the world is nervously carrying out instrument research and development and astronaut training, China is no exception, starting from Shenzhou V, China's strong strength in the field of aerospace has been fully demonstrated, until today, China is still in the forefront of the world in space.
However, while celebrating the successful launch and return of the rocket, people also found such a problem, when the Shenzhou spacecraft carried the astronauts back to Earth, the three astronauts had to complete the warehouse activity after more than two hours, and when they first came out, they could not complete the simple standing, and could only be carried out by the staff with a stool.
Logically, the physical fitness of astronauts is far superior to that of ordinary people, why do their bodies change so much after just three months of space flight, even simple standing can not be completed?
Preparation for departure
First of all, astronauts can not easily move around before leaving the cabin, and must be checked by external personnel to confirm that there is no unexpected failure before opening the hatch.
This is followed by a collection of internal gases and microbes by professionals to facilitate follow-up work, while medical staff use temporary tools to perform a preliminary physical examination of the astronauts to avoid injuries.
After completing the above two steps, astronauts can not easily move around, must stay for a period of time, adapt to the gravity of the earth before being lifted out in turn, which is why a small out of the cabin action needs to consume more than two hours of key reasons.
Decline in physical condition
You know, for human beings, the earth is the most suitable living environment, but if you adapt to the earth environment and then enter the body of the universe, you need to endure more unimaginable difficulties, the more common is weightlessness, radiation and noise and so on.
And even in such a harsh environment, astronauts have to endure and complete the required exploration and resource collection tasks, so we look at them as bright as if they are just going out for a ride, but in fact, the pressure and difficulties behind them are unimaginable.
And as we have been living on the earth, the muscles and bones in the body have developed to be able to fully adapt to the gravitational environment on the earth, once into space, due to the influence of weightless factors, astronauts need to float in the air for a long time.
In the long run, their muscles and bones will have different degrees of degradation, the rate of metabolism and blood circulation will also slow down, and sometimes even the symptoms of blood flow will occur, so the incidence of cerebrovascular disease in the astronaut center is also very high.
In order to protect the health and safety of astronauts, scientists have specially built a fitness place when designing the space station, and the facilities in it can help astronauts exercise muscles and avoid symptoms of atrophy due to long-term floating.
Standing strength
And in the selection process of astronauts, there will generally be position endurance test training, the main purpose of this training is to see how long astronauts can stand, the average person can only insist on about thirty minutes, and astronauts need to complete daily work and research work for a long time in the case of weightlessness after entering the universe.
In the case of gravity loss, the human body has to adapt to changes in the environment in order to continue to operate normally, so the blood that has been accumulating in the lower limbs on the earth will gush upwards and enter the astronaut's chest or head.
And when they return to the earth, affected by gravity, their physical condition is difficult to return to the original state for a while, for them, standing on the earth is no different from the usual handstand, especially for people with poor standing endurance, it is easy to appear dizzy or even faint.
According to relevant data, 20% of the astronauts and 80% of the space station staff will have different degrees of dizziness after returning to the earth, at this time they need to recuperate quietly, minimize all activities, and avoid increasing the burden of their recovery, so generally when they come out, there will be professionals on the ground waiting aside, holding a stretcher or wheelchair at any time to help them support, to avoid them fainting on the spot.
And not only the impact of standing endurance, long life will also make their vestibular function disorders, although their return time only takes half an hour, but nearly half of the time they will be lost because of the black barrier area, such a short period of time to find a sense of direction and gravity is not easy, so the staff on land will also try to protect them as much as possible.
epilogue
After understanding the reason why they could not stand, we could not help but sigh that it was not that they did not want to stand, but that they wanted to stand but did not have the ability, and it was admirable that they had made such a great sacrifice for the aerospace cause of the motherland and even the world.
When they came out of the warehouse and said "feel good", although it was only a simple four words, behind it contained the hardship and bitterness of the flight, the thought of the motherland for the family and the spirit of selfless dedication to their own cause.
Although every astronaut needs to undergo decades of rigorous training before flying into the universe, these trainings may be unimaginable to ordinary people, but these are the basis of their life, and space travel for them will also have a certain impact on the body and mind, the sense of weightlessness and helplessness in the unknown field, so that they are suffering at the same time unforgettable.
Salute to every astronaut and applaud their tremendous contribution.