PADI Deep Diver course- gas management

[tursiops]

As to current science on that matter, a good look at what David J. Doolette, Ph.D. is doing at the Navy Experimental Diving Unit in Panama City (I think that is the city). Interesting work and dealing with deep stops, HE vs N2, and deep "bounce" diving (what we all do). And, to repeat myself, DAN doppler research.

What I found to be one of the most interesting topics Dr Doolette discussed was the fact that Navy tables past 150' were all all extrapolations and all based on sat diving, not recreational "bounce" diving. That is something he has been studying now for a while.

Out of dae and irrelevant to the PADI Deep Diver course.

 

[boulderjohn]

DAN's experiments with doppler ultrasound testing really was a game changer and revealed that our "no decompression" dives produced quite a few bubbles on some divers.

And, to repeat myself, DAN doppler research.

I am not sure what DAN research you are talking about. Could you please link to it?

To the best of my knowledge, the first use of Doppler blood imaging was done by PADI nearly a half century ago in the studies that led to the PADI Recreational Dive Planner. Those studies did indeed show that pretty much everyone bubbles to some degree while diving, with some people bubbling more than others. They were called "silent bubbles." One of the researchers, Dr. Michael Powell, was particularly interested in that. He mentioned it on a number of occasions on ScubaBoard back when he was ScubaBoard's Doc Deco. He was confounded by the fact that some people bubbled so much--his theory, which he could never prove, related to micronuclei created by exercise.

The point of that is that the fact that people bubble during NDL dives has been known for decades. It is not anything new, and I don't understand how it relates to this discussion.

BTW, more recent research on this, done by Dr. Doolette, indicates that not only does pretty much everyone bubble, but the degree to which they bubble varies from dive to dive.

 

[jadairiii]

I am not sure what DAN research you are talking about. Could you please link to it?

Comparative Testing of Ultrasound Devices in Monitoring VGE

In this study, DAN researchers compare the effectiveness of three different ultrasound devices used to monitor post-dive venous gas emboli in healthy divers.

dan.org

 

[boulderjohn]

Comparative Testing of Ultrasound Devices in Monitoring VGE

In this study, DAN researchers compare the effectiveness of three different ultrasound devices used to monitor post-dive venous gas emboli in healthy divers.

dan.org

This is a comparison of different ultrasound devices. It is not a revelation about bubbling in NDL divers. For that, I believe we need to go way, way back to the PADI studies.

 

[jadairiii]

This is a comparison of different ultrasound devices. It is not a revelation about bubbling in NDL divers. For that, I believe we need to go way, way back to the PADI studies.

But the fact is, there are bubbles. The assumption, going back to Haldane was "no bubbles, no troubles", and no decompression needed.

We now know, for a fact, that even on, supposedly, NDL dives, we got bubbles.

 

[tursiops]

"no bubbles, no troubles",

Haldane did not say that, that I can find. Who are you quoting?

 

[boulderjohn]

But the fact is, there are bubbles. The assumption, going back to Haldane was "no bubbles, no troubles", and no decompression needed.

We now know, for a fact, that even on, supposedly, NDL dives, we got bubbles.

Yes, there are bubbles. As I wrote, PADI discovered that well over 40 years ago. There is nothing new there. So what is your point about them?

 

[jadairiii]

Haldane did not say that, that I can find. Who are you quoting?

Do you really think Haldane said that? Haldane's experiments were seeing indication of DCS in goats, and he based his modeling on that issue. If my memory serve's me.

Its Friday, enjoy.

 

[jadairiii]

Yes, there are bubbles. As I wrote, PADI discovered that well over 40 years ago. There is nothing new there. So what is your point about them?

The point was an offshoot of this topic when I made reference to every diving being a decompression dive. Which, of course, went down a rabbit hole, as most topics ultimately do on here. Why GUE developed its minimum gas standards, so that the buddy team could surface and conduct all necessary stops along the way.

That is all.

 

[steinbil]

Give it up. You are arguing with people who don't think anymore, and instead just quote GUE, wheter it is applicable or not.

How about responding to the post I wrote where I used your suggested parameters and my own thinking to argue a point in good faith and in a courteous manner, instead of just spewing inaccurate insults?