If you feel orthostatic hypertension better known as head rush . At that moment, you feel dizzy as there’s low blood pressure when you stand up from sitting or lying down.
In this condition, you could collapse against a wall or feel around a piece of furniture .You could do what fighter pilots do – clench the muscles in your lower body to push back blood to the upper body. It’s the same thing why fighter pilots black out in high G.
Here on the ground that we face 1 G as our body is used to . The acceleration due to gravity on the Earth’s surface. The harder the G the more difficult it gets to pump blood in our body.
Most of us would pass out at 4 or 5 G because our hearts can’t summon the necessary pressure. Blood pools in our lower extremities and our brains fail to get enough oxygen.
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To fight this blood pressure drop fighter pilots wear anti-G suits that constricts the legs and abdomen during the G’s to keep blood in the upper body. Muscle tension technique is also used.