Connor,
Yeah it is not really clear to me what is beneficial, is it a high level of C02 or a low level of 02 that stimulates more hemoglobin production and general body adaptation. As far as the SA02 oxygen levels read out, they stay at around 98% for about 1/2 of the breath hold (this is when there is still plenty of 02 in the lungs). Then the 02 levels drop off slowly for the next 1/4 of the hold (this is where the rest of the 02 from the lungs is getting used up). Then for the last 1/4 of the hold the 02 level "plummets" (this is where the 02 from the lungs is pretty much used up and you are using up the 02 stored in the blood by the hemoglobin). This is kind of simplification though pretty accurate I think.
cheers Wes
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"When you build something, it becomes and extension of yourself" - Mathew Honan
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