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I just got a pulse oximeter, and tried it out a few times. During the day, it registered 96-97%. I took it in the altitude tent, and after sleeping in the tent all night, tried it out when I first woke up. It read 90%.
I remember Ray Peat suggesting that 99 or 100% was not actually a great reading, as that indicated that oxygen wasn’t actually being delivered to tissues. These readings seem to be generally positive, and the lower reading after spending the night in the tent does indicate that tissues are getting more oxygen with the simulated altitude, and also that more CO2 is being retained in the body.