Connor,
No, the 02 always comes back to 98-100% during the recovery, even if its only 20 seconds. The difference in the minimum 02 at the end of each hold is purely how long I "push" the hold. The thing that most people don't understand that have not used an 02 meter is how quickly the 02 comes back up to 98-100% during recovery breathing. It's pretty amazing, maybe 5 to 10 sec max and its back to 98-100%. Now venting off the C02 takes longer (I assume) though I don't have a C02 monitor so this is just my belief from reading DB and my understanding/experience of my training. Fully purging C02 back to kind of a base line level takes 30 sec to 60 sec in my experience (depends on how hard you breathe).
Cheers Wes
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"When you build something, it becomes and extension of yourself" - Mathew Honan
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