Sorry, you guys are completely right, the surface will obviously have the greatest gradient for off-gassing.
However, I have found that even on air dives (I usually dive 32% for rec diving), I feel SUBSTANTIALLY better after a slooooow ascent dive than when I follow the normal ascent rates. I suspect that this is due to the increased ambient pressure reducing the size of the micro bubbles leading to perhaps a slower overall off-gassing but a (for me ) more efficient off-gas.
I guess my criteria for efficiency includes how much post dive fatigue etc etc I have and is not a pure time factor, should have made that a bit clearer.
However, I have found that even on air dives (I usually dive 32% for rec diving), I feel SUBSTANTIALLY better after a slooooow ascent dive than when I follow the normal ascent rates. I suspect that this is due to the increased ambient pressure reducing the size of the micro bubbles leading to perhaps a slower overall off-gassing but a (for me ) more efficient off-gas.
I guess my criteria for efficiency includes how much post dive fatigue etc etc I have and is not a pure time factor, should have made that a bit clearer.
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