Acceptable CNS/OTU's - How far do you push it

[kensuf]

Oxygen Toxicity and Special Operations Forces Diving: Hidden and Dangerous - PMC

In Special Operations Forces (SOF) closed-circuit rebreathers with 100% oxygen are commonly utilized for covert diving operations. Exposure to high partial pressures of oxygen (PO2) could cause damage to the central nervous system (CNS) and ...

www.ncbi.nlm.nih.gov

Saw this good read.

That is a great read. Thank you for sharing.

 

[GF99/99]

Yeah I don't do that. What I do is based on a lengthy discussion I had with a guy that knows a lot more about diving physiology and long decos than I do.

Will have to hear that over a beer some night. It doesn't stay up above 1.3 for more than a few minutes normally as it's getting flushed down pretty quick, but curious to hear what this guy said.

Yes this is why i started this thread. I am curious to hear what others thought are on high CNS and how they mitigate it. Would be interested to hear more about this too.

Oxygen Toxicity and Special Operations Forces Diving: Hidden and Dangerous - PMC

In Special Operations Forces (SOF) closed-circuit rebreathers with 100% oxygen are commonly utilized for covert diving operations. Exposure to high partial pressures of oxygen (PO2) could cause damage to the central nervous system (CNS) and ...

www.ncbi.nlm.nih.gov

Saw this good read.

yes interesting read.

I have some other good article too that i can share if others are interested.

 

[GF99/99]

Also on a side note has anyone else do there deco at a 1.4'ish SP from the sounds of it most are bumping up to 1.6 but I have noticed on long dives if you just run 1.4 you really only add a couple minutes to your deco but your CNSs stays much lower then it would have been on 1.6.

But then I guess this all depends on your dive style how you dive and where you bump up your SP's which could be a and entire discussion in its self.

But just a really really crude example is shown below. Not at all how I would dive this dive but just wanted to show a basic example curious if others have similar thought
Example 1: bump up to 1.2 @ first stop, bump up to 1.4 @ 45m. Total run time 351 CNS 213%

Example 2: same at example 1 but bump up to 1.6 at 6m. Total run time 349 CNS 240%

Example 3: same as example 2 but switch to 1.6 at 21m. Total run time 331 CNS 378%

 

[rjack321]

I don't think I have gone over 1.3 on deco ever. Most of the time on long dives it's down around 1.2 (for the whole dive)

18mins more on a 5.5hour dive is totally inconsequential. 150% more CNS in exchange is not a worthwhile tradeoff for me.