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.
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Is that video satire?
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.
Then perhaps what is being given to me is a 117/133. Either way they still don't fit in the racks.100s and 120s are 7.25 inches in diameter, same as an AL80. 117s and 133s are 8.0 inches in diameter.
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.
O2 inspired = 21% by volume; O2 expired = 16% by volume
O2 change = 5% by volume = 5*500/100 = 25 mL
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.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.
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.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.
I am 185cm and weigh 130kg.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.