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Published on: May 31, 2019
Theoretical tissue compartment inert gas pressures during a deep dive with and without deep decompression stops: a
Peter Buzzacott1, Virginie Papadopoulou, Adrian Baddeley
1Université de Bretagne Occidentale, Brest, France; School of Sports Science, Exercise and Health, University of Western Australia, Perth, Australia. peter.buzzacott@uwa.edu.au.
Deep decompression stops in technical diving may be mitigated by gas switching, but their physiological effects require further study. Dive profiles with deep stops should be considered experimental until validated with human data.
Area of Science:
- Physiology
- Diving Medicine
- Computational Fluid Dynamics
Background:
- Deep decompression stops are common in technical diving.
- Concerns exist regarding the redistribution of decompression stress to slower tissues.
- An exceptional exposure dive with deep stops was recorded using a dive computer.
Purpose of the Study:
- To estimate inert gas pressures in a technical diver's tissues.
- To analyze decompression profiles generated by different algorithms.
- To investigate the effects of deep stops and gas switching in exceptional exposure dives.
Main Methods:
- Utilized the R package SCUBA to estimate inert gas pressures in 17 Bühlmann (ZH-L16A) compartments.
- Interrogated dive computer recorded profiles, RGBM (Reduced Gradient Bubble Model) dive plan, and a VPM-B/E (Variable Permeability Model with Extended তত্ত্ব) profile.
- Analyzed an exceptional exposure dive profile from 76m depth.
Main Results:
- The combination of 5 gas switches appeared to ameliorate the effects of deep stops from 76m depth.
- Inert gas loading was analyzed across different decompression models.
- Potential risk factors for decompression sickness were identified.
Conclusions:
- A higher-than-anticipated inert gas content in decompression mixtures and climbing stairs post-dive may increase decompression sickness risk.
- The physiological impact of deep decompression stops during exceptional exposures, even with gas switching, needs further investigation.
- Dive profiles incorporating deep decompression stops are considered experimental until validated with human data.
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