Horizontal ascent

[kidspot]

I like horizontal ascents because it's easier to control my bouyancy with the extra resistance. I flip on my back during the last 10 ft of ascent or go vertical because I cannot see and my buddy does vertical ascents and is usually at the surface while I'm still at 10ft and just starting my 10ft/min ascent rate.

Unfortunately I still have trouble maintaining my bouyancy while upside down, so I have to work on that a bit more.

Aloha, Tim

 

[Kevrumbo]

I was told in my DIR-F Class that the Lungs have greater vascularization in the middle to lower third of the organ as a whole. Therefore you would have slightly more efficiency in off-gassing from a Horizontal Position vs. a Vertical Position, because a greater cross-section of that Lung vascularization is exposed to the absolute pressure/gradient effects as you progress along by your Deco Schedule/Profile or Safety Stop. Put in another way, visualize it as cutting a thin slice through the entire length of the Lung, as opposed to a transverse thin slice through only the width: which would yield a greater tissue cross-section?

 

[alpaj]

Basically what Kevrumbo was trying to say is that in a horizontal position the lower lung section is closer to (or at) the pressure of the gas your breathing. If your lower lungs are a vertical foot from your regs it will significantly reduce your abillity to exchange gas in those lower regions of your lungs where there exists greater vasculariztion. Try going to a pool with a snorkel, postion yourself vertically with the tip just at the surface and try and breath. Good luck. The effect with a snorkel will be greater than with a reg since the the pressure difference is more significant. So when your coming up like a drowned Sat. rat. this effect will still be quite significant.

 

[Spoon]

as the ohthers already mentioned breathing is the key while remaining neutrally buoyand. had a hard time in the beginning but youl notice is that youl ascent a breath at a time. i only fin when i want to remain stable.

 

[nagonoj]

DIR safety stops at 3 meters increment also helps to maintain horizontal trim during accent.

 

[Meng_Tze]

even more when you start doing 1m increments and hanging deco..........

 

[Randy43068]

I was told in my DIR-F Class that the Lungs have greater vascularization in the middle to lower third of the organ as a whole. Therefore you would have slightly more efficiency in off-gassing from a Horizontal Position vs. a Vertical Position, because a greater cross-section of that Lung vascularization is exposed to the absolute pressure/gradient effects as you progress along by your Deco Schedule/Profile or Safety Stop. Put in another way, visualize it as cutting a thin slice through the entire length of the Lung, as opposed to a transverse thin slice through only the width: which would yield a greater tissue cross-section?

I'd rather not visualize my lungs cut apart in that manner, thank you very much!

Good analogy , however.