Astronauts who have been in space for extended periods of time have experienced issues with their circulation and vision. This is in addition to the loss of bone and muscle tissue. To document these changes, Kelly collected fluid samples and underwent rigorous medical tests throughout her journey. If you stay in space for a prolonged period, your muscles and bones will become weaker, particularly in your legs and lower back. On Earth, gravity is always acting on you, so even if you don't consciously feel like you're resisting it, you're still using the muscles in your lower body.
In space, where gravity is much weaker, you can maintain your posture without standing on your legs and there is no need to use your legs to move around. If you remain in space for a long time, your muscles will become weaker and your bone mass will decrease. Therefore, research is being conducted to verify the effects of existing drugs on bone loss in space. In order to prevent muscle and bone weakening, astronauts exercise for around two hours each day while they are on the International Space Station (ISS). This is because gravity on Earth is stronger than in space and it is more difficult for blood to be pumped from the heart to the head.
If you stay in space for a while, the body's fluids will balance out and facial swelling usually starts to go away after a few weeks. Astronauts who stay in space, where there is almost no atmosphere, are exposed to higher energy radiation than on Earth. In space, astronauts are exposed to galactic cosmic radiation, solar radiation, cosmic solar particles, and geomagnetically bound radiation. To reduce astronaut stress, they are provided with an environment where they can talk to family and friends while they are in space and the quality of space food has been improved. Depending on where you are in space, this will take between 12 and 26 hours; however, if you're near a star, you'll burn up quickly.
Astronauts can develop stress before they even realize it when they live and work together in a small space with other astronauts for a few months. Kibo, Japan's first manned space facility, is providing humanity with results that lead to innovation and technological advancement by conducting experiments and observations that can only be carried out in space. In space, blood can be delivered less forcefully, so weakening of the heart muscles can also be a cause of dizziness when standing.
