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Key-Regular674 t1_j9g8dyx wrote

Real tip... take long deep breaths instead. Absorb oxygen.

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julie78787 t1_j9hni3r wrote

It's not a blood oxygenation problem. My O2 saturation is usually 98 percent.

There's an autonomic response to standing which can be defective in some people. When someone with that problem stands, the blood pressure in their skull rapidly declines. When the blood pressure in the skull is too low, O2 can't exchange with CO2.

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