Drmike

I am aware that He and CO2 are contributors, I am aware there is wide spread variance between individuals what I am not sure of is if the CNS% clock means anything in real terms as it doesnt take one important factor into account - what the diver is doing. Resting on deco or swiming against a current.

Has there been any published studies on the validity of the 'CNS clock' on humans in rest/work situations.

Can anyone point to the original research? I am not convinced that you are not just extrapolating ontop of flawed data (itself extrapolated)

Obviously higher PPO2s mean higher risk of toxing but what is the recover period really like?

I am informed that there are many reasons someone can convulse on dry land as well as underwater - just because they convulse underwater doesnt automatically mean they had an O2 convulsion

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Cave diving is a sport
Wreck diving is a sport
Diving in general is a sport

'Rebreather diving' is not a sport
its the delusional obsession with a highly dangerous and often inappropriate piece of equipment