Where did you measure the HbO2? Hopefully in your earlobe.
The numbers can be useful for personal training as you may begin to see at what point you get close to, or reach, blackout. Eric Fattah has done similar test on himself and I think (help us out here Eric) he has managed to get down to 11% saturation whilst still concious. I doubt many people could get below 50% without lots of training.
Ben
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