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Re: Exertion and DCS question


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Posted by Ross-O on August 22, 2006 at 10:17:06:

In Reply to: Exertion and DCS question posted by FARMHAND on August 22, 2006 at 09:35:36:

Hi Frank,

There are a number of ways in which exertion can create very small bubbles (micronuclei).

Mechanisms that create micronuclei include:

a. Tribonucleation - movement of surfaces over one another creating low pressure areas. There is a region of reduced pressure when two surface are touching and then withdrawn. Might cause the evolution of the gas phase in capillaries. Also referred to as "viscous" or "tacky adhesion." This phenomenon is present when one "pops" their knuckles or when one "clicks" their tongue on the roof of their mouth. It has been suggested that this mechanism of viscous adhesion creates microbubbles. They form on the leaflets of heart valves when they touch and then pull away at systole.

b. Reynolds cavitation - fluids moving with vortices or
constrictions which produce low pressure volumes

c. Tensile forces or dilation (negative) pressures, from musculoskeletal activity

This information comes from the Advanced Decompression Physiology Seminar manual by Dr. Powell. The Seminar will be held Sept 16-17 over at the Chamber.

http://wrigley.usc.edu/hyperbaric/advdeco.htm

Cheers,
Ross



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