Post-flight Orthostatic Intolerance
Post-flight Orthostatic Intolerance (PFOI) is a condition that affects astronauts returning to Earth after a prolonged stay in microgravity. PFOI is characterized by a decrease in blood pressure and an increase in heart rate upon standing, which can lead to dizziness, fainting, and even loss of consciousness. The condition is caused by a lack of blood volume in the lower extremities due to the redistribution of fluids in microgravity. The body's cardiovascular system is not used to the sudden change in gravity, and it takes time for it to readjust. PFOI can last for several days or even weeks after returning to Earth, and it can affect an astronaut's ability to perform tasks that require standing or walking.
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