Rebreather World - View Single Post - Training Improves Divers Ability to Detect Increased C02

***jradomski*** · 7th November 2007, 20:15

Quote: (Originally Posted by iain-hsm)

Training Improves Divers Ability to Detect Increased C02.
From Aviation Space and Environmental Medicine Vol 74 No5 May 2003

This is a significant document and worth downloading below

Abstract:
Eynan M, Daskalovic YI, Arieli Y, Arieli R, Shupak A, Eilender E, Kerem DH.

A total of 213 Navy divers were tested for CO2 retention and the ability to detect CO2 in novice divers who were either CO2-recognition-trained subjects (TS) or untrained subjects (UTS).

Results: The minimal mean inspired Pco2 that could be detected was 4.8 ± 1.6 kPa (36 ± 12 mm Hg) in UTS and 2.9 ± 0.7 kPa (22 ± 5 mm Hg) in TS (p < 0.0001).
There were 46 TS who were found to be CO2 retainers and 19 were classified as poor detectors.

Seven subjects exhibited both traits.
During actual oxygen diving performed later by this group, the only four cases of CNS-oxygen toxicity were among those seven subjects

Conclusions: that CO2 recognition training improves the diver’s capability to detect CO2. We suggest that a diver who is both a poor CO2 detector and a CO2 retainer will be prone to CNS-oxygen toxicity.

Interesting study.. I have always felt this was the case but had no data other than personal experience to back it up. A hypercapnia excercise has been part of the ANDI Rebreather curriculum since the original classes back ~1991.. Now I can point to a study that shows its a useful excercise..

7th November 2007, 20:15	#7 (permalink)
*jradomski* Moderator Current Rebreather/s: Inspiration Classic Sport Kiss Optima rEvo Other CCR Home Build Other Rebreather/s: Inspiration Vision Evolution Megalodon Classic Kiss rEvo Other CCR Home Build Join Date: Mar 2005 Location: "Da" Bronx Posts: 3,023	Re: Training Improves Divers Ability to Detect Increased C02 Quote: (Originally Posted by iain-hsm) Training Improves Divers Ability to Detect Increased C02. From Aviation Space and Environmental Medicine Vol 74 No5 May 2003 This is a significant document and worth downloading below Abstract: Eynan M, Daskalovic YI, Arieli Y, Arieli R, Shupak A, Eilender E, Kerem DH. A total of 213 Navy divers were tested for CO2 retention and the ability to detect CO2 in novice divers who were either CO2-recognition-trained subjects (TS) or untrained subjects (UTS). *Results:* The minimal mean inspired Pco2 that could be detected was 4.8 ± 1.6 kPa (36 ± 12 mm Hg) in UTS and 2.9 ± 0.7 kPa (22 ± 5 mm Hg) in TS (p < 0.0001). There were 46 TS who were found to be CO2 retainers and 19 were classified as poor detectors. Seven subjects exhibited both traits. During actual oxygen diving performed later by this group, the only four cases of CNS-oxygen toxicity were among those seven subjects *Conclusions:* that CO2 recognition training improves the diver’s capability to detect CO2. We suggest that a diver who is both a poor CO2 detector and a CO2 retainer will be prone to CNS-oxygen toxicity. Interesting study.. I have always felt this was the case but had no data other than personal experience to back it up. A hypercapnia excercise has been part of the ANDI Rebreather curriculum since the original classes back ~1991.. Now I can point to a study that shows its a useful excercise.. __________________ Joe Radomski CCR Trimix Instructor Trainer ANDI Instructor Trainer Director #10 All posts are personal opinions and DO NOT reflect any affiliated agency unless specifically stated.
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