After squatting for a long time, I feel black at the moment. Due to the change of posture, it is caused by the slow redistribution of blood in the body and the short-term lack of blood supply to the brain, which is the manifestation of positive hypotension. This is because squatting for a long time, due to the influence of lower limb extrusion, leads to a decrease in venous blood volume of lower limbs. When you suddenly stand up and change your posture, the blood flow needs to be redistributed, the lower limbs need a lot of blood to replenish, and the water flows downwards. This leads to a decrease in blood flowing back to the heart, which leads to a temporary decrease in cardiac output, and a decrease in blood pressure leads to a temporary lack of blood supply to the brain.
Normal hypotension, also known as postural hypotension, is mainly manifested in sudden changes in posture, such as suddenly standing up from supine position or squatting position, syncope, and even some people will have blurred vision, weakness, dark circles and so on. Normal hypotension is both physiological and pathological. After squatting for a long time, healthy people's standing posture changes rapidly, with only slight dizziness or blurred vision, which does not happen often and tends to be physiological; It is recommended to take medicine under the guidance of a doctor to control blood sugar or blood pressure within the normal range. This is the manifestation of cerebral ischemia. From squatting to standing, this is a change of posture, which will affect the distribution of human blood.
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