Why can't astronauts stand up and sit in wheelchairs after returning to earth? What did they sacrifice?

On the morning of April 16, the 13th spaceship "Shenzhou XIII" launched by China Manned Aviation Project landed successfully, and the space heroes Zhai Zhigang, Wang Yaping and Ye Guangfu returned to Earth. 202116 and shenzhou XIII manned spacecraft successfully separated from the rocket and entered the scheduled orbit, and successfully sent three astronauts into space. The pilot was in good condition and the launch was a complete success.

After 180 days, the astronauts completed a series of scientific research, setting one new record after another in China, laying a solid foundation for the subsequent construction of the space station. The astronauts are in good condition in the vast space, which also stems from the astronauts' innovative self-confidence and innovative breakthroughs in space technology. The starry sky is boundless.

China has made great efforts to realize manned space flight, and behind this effort, one staff member after another has worked hard day and night, realizing the re-innovation of manned space flight project. Space is an unattainable place for us and a place full of charm. Although astronauts can see the endless beauty of the universe, they are affected by the weightless environment in space and face unknown challenges and difficulties both physically and psychologically.

In order to ensure that the astronauts can land safely, the ground staff did a large-scale survey and cooperated with the simultaneous operation of various systems to ensure the safety of the astronauts. The major media showed you the real-time dynamics of outstanding astronauts by live broadcast. We can see that after the astronauts left the cabin, they were all helped to their seats by the staff and did not stand and walk by themselves. What was the situation then?

It turns out that it is necessary to wait for the safe landing of the return capsule to confirm that the astronauts are in good health. The space hero can't leave the capsule immediately, and it will take an hour or two to adapt to gravity. Moreover, after a long time of space activities, their physiological systems will change, and their bodies will not be able to adapt to the environment in a short time, so the time for leaving the cabin will not be fast. After being rescued, the space hero needs to be disinfected again, changed clothes and observed. In this process, they want to stand up and walk, but they are unable to do so, and usually feel dizzy and sick.

Mainly because long-term weightlessness flight will cause the decline of standing endurance; In addition, astronauts have lived in space for a period of time, lacking certain exercise and gravity, and muscles and bones are prone to cringe without stimulation; In addition, the time for them to return to Earth is too short, so they can't distinguish their spatial orientation. If they walk alone, they can't find the right direction. In short, we can't know the efforts and hardships behind this. They have made great contributions to China's manned spaceflight project and are heroes worthy of our admiration.