OP
Breathing rate, air integrated computers and DCI correlation
- Thread starter beaverdivers
- Start date
Please register or login
Welcome to ScubaBoard, the world's largest scuba diving community. Registration is not required to read the forums, but we encourage you to join. Joining has its benefits and enables you to participate in the discussions.
Benefits of registering include
- Ability to post and comment on topics and discussions.
- A Free photo gallery to share your dive photos with the world.
- You can make this box go away
All it's going to do is start a BS side-rant about recreational vs technical diving. What could you possibly learn from a profile that we *know* didn't hurt me? The recreational divers are going to miss the point that every dive is a decompression dive, the technical divers are going to try to explain it. Someone will say "Scuba Police", or "Nazi" or whatever and Godwin's law will be declared. Spare me the effort.Why wouldn't you?
You should have spared the recreation divers your deco planniing lecture.
Since this is the Basic Scuba Discussions forum, it's quite possible that not everyone will know who Dr Michael Powell (Dr Deco) is.
If you're wondering which authority carries more weight - the sales and marketing team at Scubapro or Dr Deco - this link
http://dornsife.usc.edu/hyperbaric/documents/cvpowell.pdf
might help.
Sent from my iPad using Tapatalk HD, which is why it takes me so long to post.
If you're wondering which authority carries more weight - the sales and marketing team at Scubapro or Dr Deco - this link
http://dornsife.usc.edu/hyperbaric/documents/cvpowell.pdf
might help.
Sent from my iPad using Tapatalk HD, which is why it takes me so long to post.
Dr Deco
Contributor
- Messages
- 2,384
- Reaction score
- 96
- # of dives
- I just don't log dives
Hello Readers :
There appears to be also questions regarding exercise and DCS. Some believe that exercise and DCS is a new topic without much to back up the idea of harm. The following excerpts show this not to be the case. Here is an old study comparing bubble formation in exercising and resting legs [in rats, I believe] from E. N. Harvey.
Comparing these two groups [active and resting], it is clear that stimulation of the hind legs causes a very significant increases in the incidence of bubble production (under reduced pressure). If only one leg is stimulated it is found that bubbles come only from that leg.
- E. Newton Harvey
Decompression Sickness, 1951
J. S Haldane noted the relationship between activity and DCS; he suggested mild exercise during decompression to promote offgassing.
Exercise and DCS is a very old topic and backed by considerable work designing decompression schedules for humans. Not all is laboratory research of the type performed today; much of it is a century old. Haldane noted that exercise at depth increases nitrogen uptake and exercise [mild] should therefore be performed during depress.
it seems desirable that where work has been done in compressed air, so that the muscles and associated tissues have become rapidly saturated with nitrogen, there should also be muscular exertion during decompression. The rate of desaturation will thus be increased so as to compensate for its increased rate of saturation.
- J. S. Haldane, The prevention of compressed-air illness. J. Hygiene Camb. 1908 p.354
As an additional safeguard, the diver is directed to keep his arms and legs constantly moving during each stoppage, so as to increase the rate of circulation and guard against the chance of the rate of desaturation during his ascent being proportionally less than the rate of saturation during his stay on the bottom while he was doing work.
- J. S. Haldane, The prevention of compressed-
air illness. J. Hygiene Camb. 1908 p. 367
It was noted that exercise during depress, exercise was harmful if vigorous.
When it was proved that exercise definitely increased susceptibility to altitude bends and chokes, controlled experiments were carried out at the Experimental Diving Unit by Van Der Aue and his coworkers. The results of rapid decompression after prolonged exposure at a critical depth indicated that exercise following exposure increased susceptibility to bends.
- A. R. Behnke, Chapter III, Decompression Sickness, 1951
Below are some papers of mine from recent years. They were performed in altitude chamber studies related to NASA work in spacesuits.
Conkin J, MR Powell. Strict adynamia reduces the risk of hypobaric decompression sickness. Undersea Hyperbaric Med., 26 (Suppl) pp. 56. (1999).
Conkin J, Powell MR. Lower body adynamia as a factor to reduce the risk of hypobaric decompression sickness. Aviat. Space Environ. Med. 72, 202 214, (2001)
Dervay JP, Powell MR, Butler B, Fife CE. The effect of exercise and rest duration on the generation of venous gas bubbles at altitude. Aviat Space Environ Med. 2002;73(1):22-7.
Dr Deco :doctor:
There appears to be also questions regarding exercise and DCS. Some believe that exercise and DCS is a new topic without much to back up the idea of harm. The following excerpts show this not to be the case. Here is an old study comparing bubble formation in exercising and resting legs [in rats, I believe] from E. N. Harvey.
Comparing these two groups [active and resting], it is clear that stimulation of the hind legs causes a very significant increases in the incidence of bubble production (under reduced pressure). If only one leg is stimulated it is found that bubbles come only from that leg.
- E. Newton Harvey
Decompression Sickness, 1951
J. S Haldane noted the relationship between activity and DCS; he suggested mild exercise during decompression to promote offgassing.
Exercise and DCS is a very old topic and backed by considerable work designing decompression schedules for humans. Not all is laboratory research of the type performed today; much of it is a century old. Haldane noted that exercise at depth increases nitrogen uptake and exercise [mild] should therefore be performed during depress.
it seems desirable that where work has been done in compressed air, so that the muscles and associated tissues have become rapidly saturated with nitrogen, there should also be muscular exertion during decompression. The rate of desaturation will thus be increased so as to compensate for its increased rate of saturation.
- J. S. Haldane, The prevention of compressed-air illness. J. Hygiene Camb. 1908 p.354
As an additional safeguard, the diver is directed to keep his arms and legs constantly moving during each stoppage, so as to increase the rate of circulation and guard against the chance of the rate of desaturation during his ascent being proportionally less than the rate of saturation during his stay on the bottom while he was doing work.
- J. S. Haldane, The prevention of compressed-
air illness. J. Hygiene Camb. 1908 p. 367
It was noted that exercise during depress, exercise was harmful if vigorous.
When it was proved that exercise definitely increased susceptibility to altitude bends and chokes, controlled experiments were carried out at the Experimental Diving Unit by Van Der Aue and his coworkers. The results of rapid decompression after prolonged exposure at a critical depth indicated that exercise following exposure increased susceptibility to bends.
- A. R. Behnke, Chapter III, Decompression Sickness, 1951
Below are some papers of mine from recent years. They were performed in altitude chamber studies related to NASA work in spacesuits.
Conkin J, MR Powell. Strict adynamia reduces the risk of hypobaric decompression sickness. Undersea Hyperbaric Med., 26 (Suppl) pp. 56. (1999).
Conkin J, Powell MR. Lower body adynamia as a factor to reduce the risk of hypobaric decompression sickness. Aviat. Space Environ. Med. 72, 202 214, (2001)
Dervay JP, Powell MR, Butler B, Fife CE. The effect of exercise and rest duration on the generation of venous gas bubbles at altitude. Aviat Space Environ Med. 2002;73(1):22-7.
Dr Deco :doctor:
ianr33
Contributor
Thanks Dr Deco.
One question if I may: Where would you draw the line between vigorous and non vigorous exercise on deco?
One question if I may: Where would you draw the line between vigorous and non vigorous exercise on deco?
Similar threads
