by George Irvine
For oxygen decompression and back gas breaks:
We have found that 12 minutes on, 6 minutes off is the ideal. We only do oxygen at 30 feet in a habitat where we have caves that accommodate this. Otherwise we do oxygen at 20 feet or slightly less in the water with the same schedule. If anyone wants to go back over why we do this and how we determine bottom gas, deco gas and exposure (or how we arrived at what we do), I can repeat it.
The short version of the answer is that we came up with this (12 on, 6 off) by trying everything and arriving at that. We knew from any of our diving that long exposures to higher ppo2s left us feeling like we had a chest cold. We started out with the usual crap that is taught out there (20 on then break) and found that to be useless. We found loss of vital capacity with these regimens.
Now we have no such negative results. The oxygen takes less than 12 minutes to reach as high an effective saturation level as is useful. Beyond that the body reacts by constricting blood vessels everywhere which limits off gassing, by trying to protect the lining of the lungs and hence thickens the transfer area by adding cells and excreting mucous which impedes gas transfer, and by causing swelling of the lung tissue which further reduces gas exchange capability, not to mention scarring and long term damage that in my opinion will come back to haunt the agencies who teach the baloney.
Returning to a more normoxic ppo2 will reverse these effects. However, if you do not return soon enough, the effects take a lot longer to reverse. The big and important thing here is not to depend on reversing this action, but to preempt it and keep it from fully developing and thus make what does occur easier to reverse and at the same time actually improve your offgassing by opening the capillaries back up and allowing gas to escape from the tissues into the blood. This "toggling" back and forth has proven to be the absolute best method of gas use in decompression.
DIR deco.
If you fail to do this at any point in the deco using high ppo2s you will merely be holding gas in tissues which may expand before it can be removed as you move up - another massive flaw in all of the existing deco programs. As you get higher in the water column, off gassing is more safely and effectively achieved by the moving the gradient and letting gas bubble into the bloodstream and be caught and removed by the lungs, but lower down this will not work - one more huge flaw in deco programs. You really should look on the WKPP site and read some of my profiles and decompressions on the longer dives to see all the massive deviations from what is thought to be correct by the agencies.
For oxygen decompression and back gas breaks:
We have found that 12 minutes on, 6 minutes off is the ideal. We only do oxygen at 30 feet in a habitat where we have caves that accommodate this. Otherwise we do oxygen at 20 feet or slightly less in the water with the same schedule. If anyone wants to go back over why we do this and how we determine bottom gas, deco gas and exposure (or how we arrived at what we do), I can repeat it.
The short version of the answer is that we came up with this (12 on, 6 off) by trying everything and arriving at that. We knew from any of our diving that long exposures to higher ppo2s left us feeling like we had a chest cold. We started out with the usual crap that is taught out there (20 on then break) and found that to be useless. We found loss of vital capacity with these regimens.
Now we have no such negative results. The oxygen takes less than 12 minutes to reach as high an effective saturation level as is useful. Beyond that the body reacts by constricting blood vessels everywhere which limits off gassing, by trying to protect the lining of the lungs and hence thickens the transfer area by adding cells and excreting mucous which impedes gas transfer, and by causing swelling of the lung tissue which further reduces gas exchange capability, not to mention scarring and long term damage that in my opinion will come back to haunt the agencies who teach the baloney.
Returning to a more normoxic ppo2 will reverse these effects. However, if you do not return soon enough, the effects take a lot longer to reverse. The big and important thing here is not to depend on reversing this action, but to preempt it and keep it from fully developing and thus make what does occur easier to reverse and at the same time actually improve your offgassing by opening the capillaries back up and allowing gas to escape from the tissues into the blood. This "toggling" back and forth has proven to be the absolute best method of gas use in decompression.
DIR deco.
If you fail to do this at any point in the deco using high ppo2s you will merely be holding gas in tissues which may expand before it can be removed as you move up - another massive flaw in all of the existing deco programs. As you get higher in the water column, off gassing is more safely and effectively achieved by the moving the gradient and letting gas bubble into the bloodstream and be caught and removed by the lungs, but lower down this will not work - one more huge flaw in deco programs. You really should look on the WKPP site and read some of my profiles and decompressions on the longer dives to see all the massive deviations from what is thought to be correct by the agencies.
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