Really stupid question... Why dive thirds with doubles?

[DA Aquamaster]

Just curious how that works ... I mean, more exertion leads to more CO2 production ... and hypercapnia is either going to lead to increased breathing or some really bad side-effects ...

swim as fast as you can while maintaining your normal breathing rate is what I meant to say.

That makes sense and addresses Bob's hypercapnia comments much better than some of the well intended but off the mark references to exceptional fitness and excellent SAC.

Even when you control for everything else, a diver will still produce about .8 liter of CO2 for every liter of O2 that is metabolized, and the diver has to maintain a normal respiration rate to keep the CO2 levels down. Skip breathing to improve SAC just does not work in the bigger picture. Fitness comes into play in terms of increasing the speed you can maintain before your normal respiration rate is no longer sufficient.

 

[marchand]

Are you trying to say that I am not exceptionally fit and that I don't have an excellent SAC?

I don't agree with you on skip breathing though...

 

[boulderjohn]

Probably entering one of those Devil's body parts, eh? They kicked my butt going in ...

The eye was the only open body part while I was there.

 

[ucfdiver]

Probably entering one of those Devil's body parts, eh? They kicked my butt going in ...

... Bob (Grateful Diver)

Getting in devils is real easy if you do it properly. You shouldn't have to kick hard or touch anything...

 

[DA Aquamaster]

Are you trying to say that I am not exceptionally fit and that I don't have an excellent SAC?

I don't agree with you on skip breathing though...

No. and "Why Not?" I'd love to hear your reasoning on how skip breathing can be done without increasing CO2 retention.

 

[MXGratefulDiver]

Getting in devils is real easy if you do it properly. You shouldn't have to kick hard or touch anything...

Anything becomes easy if you do it often enough ... unfortunately, given that I have to travel 3,300 miles to get there, my opportunities to practice the correct technique are somewhat limited.

... Bob (Grateful Diver)

 

[PfcAJ]

James is referring to the following technique for getting into Devils: Point scooter, pull trigger.

 

[MXGratefulDiver]

James is referring to the following technique for getting into Devils: Point scooter, pull trigger.

Ah ... makes perfect sense. I'm a cave newb, and although I use my scooter frequently where I dive locally, no way am I ready to consider using a scoot in a cave. I figure maybe after a coupla hundred dives I'll be ready to consider it ...

... Bob (Grateful Diver)

 

[marchand]

No. and "Why Not?" I'd love to hear your reasoning on how skip breathing can be done without increasing CO2 retention.

it can't be done without increasing CO2 retention, but it can be done to where it doesn't increase the CO2 retention enough to make a difference. especially when your PO2 is upwards of 1.0

 

[ScubaDocER]

it can't be done without increasing CO2 retention, but it can be done to where it doesn't increase the CO2 retention enough to make a difference. especially when your PO2 is upwards of 1.0

How exactly will you know when the increase in CO2 doesn't make a difference? How does one gauge when skip breathing will retain just enough CO2 to not be problematic?