Free/skin diving after diving

jluttichau · April 19th, 2007, 10:46 PM

Hi i was just talking to a friend about how it's not a good idea to go skin/free diving after a regular scubadive because you might create a temporary shunt because of the rapid pressure change. But apparently he talked to a dive phycisian about this and was told that it was not an issue. Do you guys know of any studys that has been done in regards to this issue?

cheers
Jonas

newdiver · April 20th, 2007, 05:04 AM

Quote: (Originally Posted by jluttichau)

Do you guys know of any studys that has been done in regards to this issue?

cheers
Jonas

Not studies per say but I think some work has been done on that at the Marseille, France pressure pot as they were regularly receiving spare divers with DCS. It appeared that most of them were SCUBA instructors doing spare dives during their leisure time.
Best
Philippe

vid · April 20th, 2007, 08:42 AM

If you talk to an AIDA instructor, they'll always tell you not to mix the two disciplines for this reason - I think it's in lesson 1 of the basic course.

vid

Janos · April 20th, 2007, 09:56 AM

IIRC George also had something to say on the subject. The original article was about the reasons we don't bounce dive (to collect stages and so forth) after big dives, but I *think* he says the same applies to free diving too.

Most people don't do it because any bubbles in your blood stream will shrink during the dive, possibly becoming so small that they slip though to the arterial side, and then expanding as you come back up, giving you a blockage on the arterial side, ie a bend.

Janos

MonkSeal · April 20th, 2007, 10:01 AM

Quote: (Originally Posted by jluttichau)

But apparently he talked to a dive phycisian about this and was told that it was not an issue.

There are dive phycisians and "dive phycisians". As in any other job some people are expanding their knowledge and the others not.

Tricky · April 20th, 2007, 10:03 AM

Quote: (Originally Posted by vid)

If you talk to an AIDA instructor, they'll always tell you not to mix the two disciplines for this reason - I think it's in lesson 1 of the basic course.

This is what I was taught on my AIDA course. The recommendation is to leave 24 hours between a scuba dive and a free dive, and vice versa.

jure · April 20th, 2007, 10:05 AM

Quote: (Originally Posted by Janos)

IIRC George also had something to say on the subject. The original article was about the reasons we don't bounce dive (to collect stages and so forth) after big dives, but I *think* he says the same applies to free diving too.

Janos

It is actually a pretty good article. You can read it here: Bounce diving

Here is something on pulmonary filter:
The lung as a filter for microbubbles -- Butler and Hills 47 (3): 537 -- Journal of Applied Physiology

jluttichau · April 20th, 2007, 10:05 AM

Quote: (Originally Posted by MonkSeal)

There are dive phycisians and "dive phycisians". As in any other job some people are expanding their knowledge and the others not.

Sure but if there has not been done any scientific research on the subject then anyone can guess about what is going on.. that's why I'm looking for articles written about it.

Cheers
jonas

jluttichau · April 20th, 2007, 10:11 AM

Quote: (Originally Posted by jure)

It is actually a pretty good article. You can read it here: Bounce diving

I think that was where i read it originally, and there are not really any practical reasons to do skin diving after diving but out of an academic interest i would like to find out if this is actually a "proven fact" or just an arbitrary rule enforced by WKPP and other agencies.

Quote: (Originally Posted by jure)

Here is something on pulmonary filter:
The lung as a filter for microbubbles -- Butler and Hills 47 (3): 537 -- Journal of Applied Physiology

From the abstract it doesn't seem to be relevant to the matter?

Cheers
Jonas

MonkSeal · April 20th, 2007, 10:22 AM

Quote: (Originally Posted by jluttichau)

Sure but if there has not been done any scientific research on the subject then anyone can guess about what is going on.. that's why I'm looking for articles written about it.

Cheers
jonas

This is not exactly free diving after scuba but intensive bouncing during shallow dive after deep dive:
Rubicon Research Repository: Item 123456789/1616

You can search this repository to find something more.

April 19th, 2007, 10:46 PM	#1 (permalink)
jluttichau(Offline) Custom User Title Join Date: Nov 2005 Location: Denmark Posts: 437	Free/skin diving after diving Hi i was just talking to a friend about how it's not a good idea to go skin/free diving after a regular scubadive because you might create a temporary shunt because of the rapid pressure change. But apparently he talked to a dive phycisian about this and was told that it was not an issue. Do you guys know of any studys that has been done in regards to this issue? cheers Jonas

April 20th, 2007, 09:56 AM	#4 (permalink)
Janos(Offline) "Two Sheds" Join Date: Nov 2005 Location: Surrey Posts: 400	IIRC George also had something to say on the subject. The original article was about the reasons we don't bounce dive (to collect stages and so forth) after big dives, but I think he says the same applies to free diving too. Most people don't do it because any bubbles in your blood stream will shrink during the dive, possibly becoming so small that they slip though to the arterial side, and then expanding as you come back up, giving you a blockage on the arterial side, ie a bend. Janos __________________ You can lead a horse to water but you can't climb a ladder with a large bell in both hands - Vic Reeves www.hellfins.com/shed

April 20th, 2007, 10:03 AM	#6 (permalink)
Tricky(Offline) New Member Join Date: Nov 2005 Location: Reading, Berkshire Posts: 555	Quote: (Originally Posted by vid) If you talk to an AIDA instructor, they'll always tell you not to mix the two disciplines for this reason - I think it's in lesson 1 of the basic course. This is what I was taught on my AIDA course. The recommendation is to leave 24 hours between a scuba dive and a free dive, *and* vice versa. __________________ "I know that you believe that you understand what you think I said, but I am not sure you realise that what you heard is not what I meant." "Make me one with everything" said the Mystic to the Hamburger vendor. UK Diving Forum Sryth: A Free Online Text RPG Join the Adventure! Fallen Sword: Free online RPG

April 20th, 2007, 10:05 AM	#7 (permalink)
jure(Offline) New Member Join Date: Jan 2007 Location: Slovenija Posts: 10	Quote: (Originally Posted by Janos) IIRC George also had something to say on the subject. The original article was about the reasons we don't bounce dive (to collect stages and so forth) after big dives, but I think he says the same applies to free diving too. Janos It is actually a pretty good article. You can read it here: Bounce diving Here is something on pulmonary filter: The lung as a filter for microbubbles -- Butler and Hills 47 (3): 537 -- Journal of Applied Physiology __________________ VPMOpen - opensource decompression program http://www.geocities.com/vpm.open/index.html

April 20th, 2007, 10:11 AM	#9 (permalink)
jluttichau(Offline) Custom User Title Join Date: Nov 2005 Location: Denmark Posts: 437	Quote: (Originally Posted by jure) It is actually a pretty good article. You can read it here: Bounce diving I think that was where i read it originally, and there are not really any practical reasons to do skin diving after diving but out of an academic interest i would like to find out if this is actually a "proven fact" or just an arbitrary rule enforced by WKPP and other agencies. Quote: (Originally Posted by jure) Here is something on pulmonary filter: The lung as a filter for microbubbles -- Butler and Hills 47 (3): 537 -- Journal of Applied Physiology From the abstract it doesn't seem to be relevant to the matter? Cheers Jonas Last edited by jluttichau; April 20th, 2007 at 10:18 AM.

April 20th, 2007, 05:04 AM	#2 (permalink)
newdiver(Offline) New Member Join Date: Feb 2006 Location: Chicago Posts: 44	Quote: (Originally Posted by jluttichau) Do you guys know of any studys that has been done in regards to this issue? cheers Jonas Not studies per say but I think some work has been done on that at the Marseille, France pressure pot as they were regularly receiving spare divers with DCS. It appeared that most of them were SCUBA instructors doing spare dives during their leisure time. Best Philippe

April 20th, 2007, 08:42 AM	#3 (permalink)
vid(Offline) New Member Join Date: Nov 2005 Location: london/surrey border, UK Posts: 353	If you talk to an AIDA instructor, they'll always tell you not to mix the two disciplines for this reason - I think it's in lesson 1 of the basic course. vid

April 20th, 2007, 10:01 AM	#5 (permalink)
MonkSeal(Offline) Old Member Join Date: Feb 2006 Location: Zagreb, Croatia Posts: 472	Quote: (Originally Posted by jluttichau) But apparently he talked to a dive phycisian about this and was told that it was not an issue. There are dive phycisians and "dive phycisians". As in any other job some people are expanding their knowledge and the others not.

April 20th, 2007, 10:05 AM	#8 (permalink)
jluttichau(Offline) Custom User Title Join Date: Nov 2005 Location: Denmark Posts: 437	Quote: (Originally Posted by MonkSeal) There are dive phycisians and "dive phycisians". As in any other job some people are expanding their knowledge and the others not. Sure but if there has not been done any scientific research on the subject then anyone can guess about what is going on.. that's why I'm looking for articles written about it. Cheers jonas

April 20th, 2007, 10:22 AM	#10 (permalink)
MonkSeal(Offline) Old Member Join Date: Feb 2006 Location: Zagreb, Croatia Posts: 472	Quote: (Originally Posted by jluttichau) Sure but if there has not been done any scientific research on the subject then anyone can guess about what is going on.. that's why I'm looking for articles written about it. Cheers jonas This is not exactly free diving after scuba but intensive bouncing during shallow dive after deep dive: Rubicon Research Repository: Item 123456789/1616 You can search this repository to find something more.