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Impacts of Free-falling Spheres on a Deep Liquid Pool with Altered Fluid and Impactor Surface Conditions

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Published on: February 17, 2019

Bubble formation after a 20-m dive: deep-stop vs. shallow-stop decompression profiles.

Nico A M Schellart¹, Jan-Jaap Brandt Corstius, Peter Germonpré

¹Department of Medical Physics, Academic Medical Centre, University of Amsterdam, The Netherlands. N.A.Schellart@amc.uva.nl

Aviation, Space, and Environmental Medicine

|May 27, 2008

Summary

This summary is machine-generated.

Performing a deep stop in scuba diving did not reduce, but significantly increased, detectable precordial bubbles compared to a shallow stop. This challenges the deep stop theory for preventing decompression sickness.

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Published on: January 10, 2017

Area of Science:

Diving Physiology
Decompression Theory
Bubble Formation Dynamics

Background:

The
deep stop
theory suggests reducing bubbles and decompression sickness risk by stopping at half maximal diving depth (MDD).
However, Haldanian modeling predicts more bubbles with prolonged decompression, questioning the deep stop's benefit without increased dive time.

Purpose of the Study:

To investigate if a deep-stop dive (DSD) produces more or fewer bubbles than a shallow-stop dive (SSD).
To test the deep stop theory without altering total decompression time.

Main Methods:

Recreational divers performed either DSD or SSD, matched biometrically.
Dive profile: MDD 20 msw, bottom time 40 min, total dive time 47 min.
In DSD, 3 min of the 7 min shallow stop (4 msw) was replaced by a deep stop (10 msw).

Main Results:

Deep-stop dives (DSD) resulted in significantly more precordial bubbles than shallow-stop dives (SSD).
P-values ranged from 0.00007 to 0.038, indicating statistical significance.

Conclusions:

The increased supersaturation after surfacing in DSD appears to outweigh potential benefits of the deep stop on bubble formation.
The utility of deep stops for dives up to 20 msw is questionable, warranting further research.