Guest viewing is limited
  • Welcome to the DeeperBlue.com Forums, the largest online community dedicated to Freediving, Scuba Diving and Spearfishing. To gain full access to the DeeperBlue.com Forums you must register for a free account. As a registered member you will be able to:

    • Join over 44,280+ fellow diving enthusiasts from around the world on this forum
    • Participate in and browse from over 516,210+ posts.
    • Communicate privately with other divers from around the world.
    • Post your own photos or view from 7,441+ user submitted images.
    • All this and much more...

    You can gain access to all this absolutely free when you register for an account, so sign up today!

  • PLEASE NOTE: There will be forum downtime today (Thursday 13th May 2021) as we migrate to a new server and do some housekeeping!

O2 levels

Thread Status: Hello , There was no answer in this thread for more than 60 days.
It can take a long time to get an up-to-date response or contact with relevant users.

soki

New Member
Aug 5, 2002
6
0
0
49
I made some testes (not seriously), with a machine which measure the blood O2 level. So I got something like this:
97% when breathing normally and 80% after 3 min of dry static apneea. Actually these values do not have any sense for me... Is anybody so kind to share me some info...like what happen at different levels, what is the lower limit... and things like this.
10x
 

Ben Gowland

Aplysia gowlandicus
Apr 4, 2002
365
41
118
44
Where did you measure the HbO2? Hopefully in your earlobe.

The numbers can be useful for personal training as you may begin to see at what point you get close to, or reach, blackout. Eric Fattah has done similar test on himself and I think (help us out here Eric) he has managed to get down to 11% saturation whilst still concious. I doubt many people could get below 50% without lots of training.

Ben
 

crazyfrenchmen

CW = Crazy'n Wet
Oct 17, 2001
185
10
0
47
CO2 level

Hi,
the biggest problem for Freediver is not the O2 level but rather the CO2 level. At a certain level of CO2, the brain stop working and you suffer a black out. The CO2 level is also what trigger the breathing reflex, not the low O2 level.
 

narked

New Member
Jul 10, 2002
145
4
0
36
The CO2 DOES trigger the breathing reflex, but surely the low O2 level causes the blackout? The brain shuts everything non vital down when the O2 level gets too low, to conserve as much of the remaining O2 as possible. Never read/heard of the blackout being caused by the build up of CO2. I could be wrong, dunno.
But my biggest problem is the buildup of CO2, that breathing reflex is a bitch to fight ;)
 

efattah

Well-Known Member
Mar 2, 2001
3,294
487
173
CO2 vs O2

CO2 buildup can also cause a blackout, but it is far less common than a low O2 blackout, because CO2 blackouts cannot occur during breath-holds at atmospheric pressure--if you want to experience a CO2 blackout, you either need to do apnea at extreme depth (and stay there), or you need to inhale pure O2 at the surface, and neither are recommended!

If you just do apnea at atmospheric pressure, you will blackout from low O2 long before your CO2 level reaches 'blackout' danger levels....


Eric Fattah
BC, Canada
 

soki

New Member
Aug 5, 2002
6
0
0
49
Hi Ben,
I measured it with a device attached on my finger. It use spectromeatry to determine the saturation of oxigen in blood. Do you think there is a wrong place to measure O2 level? 11% sounds very low for me...it is possible to use another reference for the satturation(?).What I can say by my own, is that in the first two minuts the level decrese very slow,(to 90% or something) then in the third minute it decrese to 80%, mostly in the last 20 seconds, when I have experienced strong contractions. Also I saw that the hart rate was increesed during contraction, and it should be the reason for the accelerated O2 level decrees. It will be interested a graphic with relations between time(and contractions moments) , O2, hart rate ...maybe I'll do it next time..:)
 
DeeperBlue.com - The Worlds Largest Community Dedicated To Freediving, Scuba Diving and Spearfishing

ABOUT US

ISSN 1469-865X | Copyright © 1996 - 2021 deeperblue.net limited.

DeeperBlue.com is the World's Largest Community dedicated to Freediving, Scuba Diving, Spearfishing and Diving Travel.

We've been dedicated to bringing you the freshest news, features and discussions from around the underwater world since 1996.

ADVERT