O2 During Safety Stop?

[DRE]

Dan,

before you start adding the O2 I'd look at a couple of factors that might be contributing to post-dive fatigue: what are your dive parameters (depth/time), are you approaching the NDL's (or doing deco dives), how do you shape your ascents (ie do you go fairly shallow quickly, or do you incorporate some kind of deep stops in your ascent even for a no-deco dive), what kind of actual stops are you doing (3min at 15ft vs 1min@40, 1@30, 3@20 and 3min ascent to surface from 20ft), etc.

Adding O2 at 20ft might reduce your post-dive fatigue somewhat, although I believe you'll get much better results by adding some He in your mix than by jacking up your O2. If your doing a dive to 100ft on 30/30 vs EAN 32 the 30% He will be out of your system by the time you surface (if you do a proper ascent), which means that there's already 30% less residual inert gas left - it's a question of simple math above and beyond all the underlying physiological interactions.

You're only drawback would be cost of the mix, but that's a decision you'll have to make (or not make ).

Feel free to PM me with any further questions.


David.