The VPM presumes that microscopic bubble nuclei always exist in water and tissues that contain water. Any nuclei larger than a specific "critical" size, which is related to the maximum dive depth (exposurepressure), will grow during decompression when the diver ascends. The VPM aims to minimize the total volume of these growing bubbles by keeping the external pressure sufficiently large and the inspired inert gas partial pressures relatively low during decompression. The model depends on the assumptions that different sizes of bubbles exist within the body, that the larger bubbles require less reduction in pressure to begin to grow than smaller ones, and that fewer large bubbles exist than smaller ones. These assumptions can be used to construct an algorithm that provides decompression schedules, designed to eliminate the larger, growing bubbles before they cause problems.[2][3]
Varying permeability refers to the layer of molecules surrounding the bubbles, which may vary in permeability to gas molecules in the bubble and the surrounding medium, and which affect the diffusion of gases between the surroundings and the bubble, and the variation of compressibility of the bubble under changes of pressure.
This sectionneeds expansion with: describe model in more detail: statistical distribution of bubble sizes, internal pressure of bubbles, etc.. You can help byadding to it.(October 2021)
Yount, D.E.; Hoffman, D.C. (1984).Bachrach, Arthur J.; Matzen, M.M. (eds.).Decompression theory: A dynamic critical-volume hypothesis. Underwater physiology VIII: Proceedings of the eighth symposium on underwater physiology. Bethesda:Undersea and Hyperbaric Medical Society. pp. 131–146.
Yount, D.E.; Hoffman, D.C. (1986). "On the use of a bubble formation model to calculate diving tables".Aviat Space Environ Med.57 (2):149–156.ISSN0095-6562.PMID3954703.
Yount, D.E.; Hoffman, D.C. (1989). "On the use of a bubble formation model to calculate nitrogen and helium diving tables". In Paganelli, C.V.; Farhi, L.E. (eds.).Physiological functions in special environments. New York: Springer-Verlag. pp. 95–108.
Yount, D.E.; Maiken, E.B.; Baker, E.C. (2000). Lang, M.A.; Lehner, C.E. (eds.).Implications of the Varying Permeability Model for Reverse Dive Profiles. Proceedings of the Reverse Dive Profiles Workshop. Washington, D.C.: Smithsonian Institution. pp. 29–61.
D'Arrigo, J.S. (1978). "Improved method for studying the surface chemistry of bubble formation".Aviat Space Environ Med.49 (2):358–361.ISSN0095-6562.PMID637789.
Kunkle, T.D. 1979. Bubble nucleation in supersaturated fluids. Univ. of HawaiiSea Grant Technical ReportUNIHI-SEAGRANT-TR-80-01. Pp. 108.
Paganelli, C.V.; Strauss, R.H.; Yount, D.E. (1978). "Bubble formation within decompressed hen's eggs".Aviat Space Environ Med.48 (1):48–49.ISSN0095-6562.PMID831713.
Yount, D.E.; Kunkle, T.D.; D'Arrigo, J.S.; Ingle, F.W.; Yeung, C.M.; Beckman, E.L. (1977). "Stabilization of gas cavitation nuclei by surface-active compounds".Aviat Space Environ Med.48 (3):185–191.ISSN0095-6562.PMID856151.
Yount, D.E. (1979). "Application of a bubble formation model to decompression sickness in rats and humans".Aviat Space Environ Med.50 (1):44–50.ISSN0095-6562.PMID217330.
Yount, D.E.; Hoffman, D.C. (1983). Hoyt, J.W. (ed.). "On the use of a cavitation model to calculate diving tables".Cavitation and Multiphase Flow Forum 1983. New York:American Society of Mechanical Engineers:65–68.OCLC232584820.
^Yount, DE (1991)."Gelatin, bubbles, and the bends".In: Hans-Jurgen, K; Harper Jr, DE (Eds.) International Pacifica Scientific Diving... 1991. Proceedings of theAmerican Academy of Underwater Sciences Eleventh Annual Scientific Diving Symposium held 25–30 September 1991. University of Hawaii, Honolulu, Hawaii. Archived from the original on January 13, 2013. Retrieved2011-10-14.
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