Sounds very scientific. But in practicality I can relate. When spearfishing I am in the water for sometimes 2 hours. As soon as I enter the water my breathing pattern changes from normal. I relax and conciously take slow deep breaths then 3 or 4 hyperventilations before the dive. I hold this breathing pattern thru-out the dive session. This feels natural and it seems as the dive progresses my bottom time keeps improving until of course fatigue sets in.
Ray
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