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Indeed. Looking into our heritage, this is very normal! A human that is suddenly submerged (e.g. from a fall into water) has to immediately and effectively hold his or her breath. Full lungs mean life in that situation. Our reflexes do not inutitively know that there is a very ample supply of...

Fully agreed. And that is different from static breath holding, where, as Simon Mitchell and others already noted here, basically everyone sees much longer times with O2. Although part of that effect is the hyperventilation part that to some extent also would work with air, O2 adds on that.

Gelirfella, you mean me? Then maybe postings crossed. I was talking about a regime existing where high inspired fO2 moves backward the urge.

Gelirfella, well, one regime has been named here already, it is apnea times. But in general, as said many times, I do agree; I also do not expect to see a notable effect in scuba diving air consumption.

Would indeed be interesting to check! "Urge to breathe" is a bit unspecific. It can be a rather psychological urge, that would then not change with fO2. Or it can be driven by CO2 and the need to eliminate that, which is quite similar for air and nitrox. A notable difference in gas consumption...

Sorry but that is diverging now! The question was not "How can a diver practically reduce air consumption?", and also not about gas densities, at least not to my reading. The question was for an explanation whether breathing pure oxygen (or nitrox) -- both happens inevitably e.g. during most...

Well we were considering the question in a scientific context, not if that is a good idea from a practical vewpoint. It does come up from time to time, and I personally think it has a rather clear answer: "In theory, yes that happens, but in practice normally one will not notice".

Well that goes into the direction I am talking about. Just compare your breathing pattern right now, fully relaxed on land, with your pattern while fully relaxed during a dive. Very probably the two will be different. For a number of reasons. A lessened urge to breathe will only matter for gas...

There surely are several effects. In the end, the "experiment" that was suggested above (static apnea time after pre-breathing O2) results in very significantly longer apnea times. Of couse in scuba diving we very often breath much higher ppO2 than on dry land, even when using air. My basic...

It is not only the "purging" of CO2 from the lungs; pre-breathing O2 results in generally longer apnea times than doing the same pre-breathing pattern with air. The higher O2 concentration in effect also lessens the chemoreceptor response to the rise of the CO2. But I would like to comment on...

Putting aside for the moment that of course there are many other factors involved, including training and experience: it may even be! Many seasickness meds are actually H1 antagonists. Those are centrally acting and can influence both heart rate and breathing. I know of no solid data to even...

I dive Atomic and I am German. I think it is more or less because they are quite more expensive than other options here. And people here always like to tell themselves what they dive would be "the safest", so they advertise diaphragm regs. Of course with little empirical back up, but that is...

Tribal, basically all gases we use for diving are narcotic, it is a question of relative potential, not of yes/no. Even helium causes narcosis, just much less than nitrogen (and maybe oxygen). At 300+ meters, narcosis is unavoidable at least to some degree.

15 hours is to surface. They are talking about a deeper part of the ascent.

Welcome :)

Welcome back :)

jale, in fairness however the horizontal front zips can also be a pain to close without a buddy. Do not know about that Beuchat specifically though.

Honestly among the best portraits of them I have ever seen!

Advising people can only go so far...

Even if there is no scuba law in your area, I would recommend against it. Thinking back to my starting days, I would probably not even have endangered myself, but simply miserably failed to descend and come into trim. Much more fun also to do it under instruction!