• Welcome to ScubaBoard


  1. Welcome to ScubaBoard, the world's largest scuba diving community. Registration is not required to read the forums, but we encourage you to join. Joining has its benefits and enables you to participate in the discussions.

    Benefits of registering include

    • Ability to post and comment on topics and discussions.
    • A Free photo gallery to share your dive photos with the world.
    • You can make this box go away

    Joining is quick and easy. Login or Register now by clicking on the button

decrease heart rate after strong effort under water

Discussion in 'Search & Rescue' started by curamax, Jun 26, 2019.

  1. The Chairman

    The Chairman Chairman of the Board Staff Member

    # of Dives: I just don't log dives
    Location: Cave Country!
    61,917
    30,392
    Chemoreceptors in the brain are largely tied to CO2 and not oxygen. This is why we can go on %100 surface O2 and not feel weird. The more oxygen you metabolize, the more CO2 you produce. IOW, a build-up of CO2 is what causes you to want to take a breath... not the lack of O2. In fact, if your O2 is off on your rebreather, you'll probably never know unless you monitor it via working oxygen cells. You'll simply go to sleep, never to awake never knowing your O2 is so low that it won't support life.
     
  2. chillyinCanada

    chillyinCanada ScubaBoard Supporter Staff Member ScubaBoard Supporter

    30,452
    20,275
    When I go deep or have to exert myself for some reason, I concentrate even more on my breathing and more slowly draw in and more fully exhale. This has always protected my air usage and made me feel better on the whole.

    That said, I have been known to completely stop, even head down feet up and do nothing more than concentrate on breathing fully out and draw slowly in again until i have recovered from whatever excitement ie current/shark activity etc. had caused my heart rate increase.
     
    The Chairman likes this.

Share This Page