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Breathing technique

Discussion in 'Advanced Scuba Discussions' started by giovyledzep, Dec 30, 2019.

  1. Heat Miser

    Heat Miser Angel Fish

    # of Dives: 100 - 199
    Location: Perth
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    One thing I did recently was buy a Perdix AI, which has a real time SAC rate in BAR (or perhaps PSI for my North American friends ... but BAR's easier because you just multiply SAC Rate in BAR by Tank Capacity Litres to get to Litre per minute). I hesitated buying it, because I was worried that I would stare at it all the time, but it has helped lower my my SAC rate by 40%. In the course of a couple of months.

    I'm not certain you need to have SAC rate below 10L/min, to do tech diving. Certainly I don't. I just came back from the Maldives and a couple of the instructors there have 7l/min SAC's they hop out of the water and have a cigarette. So it has nothing to do with respiratory fitness, despite what people say. Buy a rebreather and it won't matter, because they really do measure respiratory fitness.
     
  2. PfcAJ

    PfcAJ Orca

    # of Dives: 5,000 - ∞
    Location: St Petersburg, Fl
    7,576
    6,253
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    Id like to see what happens when they have to do some exertion (strong current, helping an incapacitated buddy, etc).

    Rebreather isn’t a magic carpet. If your sac rate is high you’ll quickly run into bailout limits. Same thing apples as above regarding exertion, too. Low Co2 exchange in an inherently high WOB environment will be exacerbated by smoking.
     
    arthurng311 and Heat Miser like this.
  3. dewdropsonrosa

    dewdropsonrosa Solo Diver

    # of Dives: 200 - 499
    Location: Seattle, WA
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    Breathe in:
    1-2-3

    Breathe out:
    1-2-3-4

    I generally keep the same number of counts, but the duration of each beat might change. In still open water at a leisurely pace, I might only have 6-7 breaths per minute. Swimming upstream into current, I'll breathe more frequently as needed to support the exertion.
     
  4. Heat Miser

    Heat Miser Angel Fish

    # of Dives: 100 - 199
    Location: Perth
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    Yes I understand what you are saying about being bailout constrained on a Rebreather, but the original poster say he want to get into teck too.

    I just question how easy is it to guestimate your SAC rate in a bailout scenario. - if you bail out because of a Co2 hit its going to be hard to maintain a low SAC rate. Your going to be stressed and SAC is going to be MUCH MUCH higher than the avg 18l/min

    So the safe option Dive your rebreather with a BIGGER bail out tank.
     
  5. Heat Miser

    Heat Miser Angel Fish

    # of Dives: 100 - 199
    Location: Perth
    27
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    Yes I agree, I wasn't promoting smoking and diving, more putting it out there how surprised I was to see instructors smoking, also surprised that they had 7 L SAC's. It seems rationally sub-optimal to me.
     
  6. ofg-1

    ofg-1 Course Director

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    Breathing is just like sex, in-out-repeat as needed.
     
    Heat Miser likes this.
  7. shoredivr

    shoredivr Solo Diver

    # of Dives: 1,000 - 2,499
    Location: Ontario
    8,291
    7,938
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    Frog kick is used extensively in technical diving, along with shorter more rigid blades.
     
  8. BlueTrin

    BlueTrin DIR Practitioner

    # of Dives: 100 - 199
    Location: London
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    @Angelo Farina is horizontal scissor kick the one where you turn sideways and close the legs one fin on the top of each other ?
     
  9. Angelo Farina

    Angelo Farina Marine Scientist

    # of Dives: 1,000 - 2,499
    Location: Parma, ITALY
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    NO. The body stays horizontal, and legs are opened by keeping them perfectly straight. The left leg goes to left, the right leg goes to right, perfectly extended, without flexing knees or ankles.

    I need to find a video of my wife using it. I did not find any video on youtube showing it...
    The opening movement is like a dancer, but a dancer opens her legs much more (180 degrees instead of 90):

    manifestazione-della-ballerina-spaccata-sul-pavimento-dello-studio-92042239.jpg
     
  10. Angelo Farina

    Angelo Farina Marine Scientist

    # of Dives: 1,000 - 2,499
    Location: Parma, ITALY
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    I know. Very good for avoiding to raise mud and silt from the bottom, as legs and fins are kept well above the body.
    Unfortunately this kick is very disruptive for the red coral inside the caves of Capo Caccia, so it is substantially forbidden there.
    Also the rear-mounted cylinder is better avoided inside these caves, often it was required to move the cylinder in front, pushing it with hands along the tunnel, or to use side mount.
    In some passages, it was recommended to proceed face-up: this way you better see the coral, and you avoid hitting it with parts of your body or equipment.
    I love those caverns, truly spectacular, and not so dangerous as, for example, capo Palinuro, where many lives were lost.
     
    shoredivr likes this.

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