Huge air consumption even after +200 dives

[davehicks]

Try to "pulse" your inhales and exhales. Like a little sip/puff on a 5 count for inhale/exhale. You don't need to gulp and blow in a big stream. This becomes very natural with just a little practice.

 

[lowwall]

​

Is that video satire?

It is absolutely terrible. Seriously he gets almost everything wrong. He recommends a 3 second inspiratory pause at the end of an exhalation, shallow breaths, and using your BCD inflator to make minor changes in your bouyancy.

He also doesn't understand inertia. He shows the body ascending and descending during each inhale and exhale, but in reality it takes time for your body to ascend or descend in response to changes in your volume. The changes due to breathing basically cancel out.

 

[LFMarm]

Is that video satire?

It is absolutely terrible. Seriously he gets almost everything wrong. He recommends a 3 second inspiratory pause at the end of an exhalation, shallow breaths, and using your BCD inflator to make minor changes in your bouyancy.

He also doesn't understand inertia. He shows the body ascending and descending during each inhale and exhale, but in reality it takes time for your body to ascend or descend in response to changes in your volume. The changes due to breathing basically cancel out.

I don’t disagree. I wanted to share because there are other points of view on gas consumption and breathing. Without getting in the merit of the points he is making, this works for him. I saw him in the water and he has almost perfect buoyancy and pretty low SAC from what he shared.

 

[DreadnoughtNH]

100s and 120s are 7.25 inches in diameter, same as an AL80. 117s and 133s are 8.0 inches in diameter.

Then perhaps what is being given to me is a 117/133. Either way they still don't fit in the racks.

 

[dmaziuk]

Breathing underwater has one tremendous advantage when it comes to breathing rate. The number of oxygen molecules in each breath is significantly larger than you get at the surface. The result of this is that if you can keep your work load reasonable, you can take fewer breaths per minute than at the surface without any concerns about depriving your tissues of the O2 they need.

The number I see quoted everywhere is

O2 inspired = 21% by volume; O2 expired = 16% by volume
O2 change = 5% by volume = 5*500/100 = 25 mL

Which means your breathing rate on the surface is not limited by the amount of O2 in the mix. It follows that raising PPO2 -- by raising pressure and/or O2% (as in Nitrox) -- will make absolutely zero difference to your breathing rate.

Sorry.

 

[happy-diver]

Whenever I have attempted any of these weirdo techniques I forget after three breaths
and just get on with diving breathing, whichever way I might breathe, when I go diving

My figures have indicated, that as you go diving you get plenty of practice from events
unexpected as they occur without the necessity to spend diving time, practising events

 

[lowwall]

The number I see quoted everywhere is


Which means your breathing rate on the surface is not limited by the amount of O2 in the mix. It follows that raising PPO2 -- by raising pressure and/or O2% (as in Nitrox) -- will make absolutely zero difference to your breathing rate.

Sorry.

Congratulations. You have discovered that you can safely lower your breathing rate by extending your exhale on the surface as well. Somebody should tell singers and bagpipers about this.

Which, by the way, is evidence of the safety of this approach despite it feeling unnatural at first.

The higher PPO2 is an advantage because it allows you to maintain a slow breathing cadence for a longer period of time and/or at a higher workload than you can at the surface.

 

[Eric Sedletzky]

Maybe you just use what you use, that’s just you and nothing to be ashamed of.
You need to figure out a way to get a bigger tank.

 

[Tycksel]

I'm about your same height and weight. Like you, I've optimized my weighting, my technique, streamlining, and keep my SAC rate down. Trouble is, due to our size, we have proportionally larger muscles, larger lungs, and higher O2 consumption as a result. If you workout regularly -- particularly strength training -- it's even worse!

Simplest solution: bigger tank (100cf or 120cf). It will be proportional to your size. My friends like to joke that I carry a water heater on my back, but it's honestly not a hindrance given my size. I just make sure to bring a bungee or ratchet strap to keep it rolling around the boat since the larger diameters don't usually fit in the tank racks.

Yeah we used to have 15L (or 13,2L precise) tanks on our boat too, but because they didn't fit to racks, they removed those.

 

[Blackcrusader]

Yeah they have filmed me many times. My trim is totally horizontal and I'm also diving with wing, so that makes horizontal trim quite easy. Not using hands at all when I dive. I usually kick, glide for 5 seconds and then they still for around 5 seconds.

I always go up a little when I inhale and go down a little when I exhale, so that's why I think that my buoyancy is just ok.

I'm using 3mm vest with hood and 3mm full wetsuit. Water temperature is 28-29c. I'm quite happy with that and don't feel cold.

I am 185cm and weigh 130kg.

You say you breathe every few seconds. I generally breathe in every 15 second and then exhale... My sac rac is less than 10l/min often 8l/min or less depending on conditions.

This video of me taken by a dive buddy. I breathe every 15 - 20 seconds or so Just been in Maldives. One German chap was telling me he breathes three times to every time I breathe.


This though was nuts even for me. I think my brain must have shut down. AL80