The Varying Permeability Model, Variable Permeability Model or VPM is an algorithm that is used to calculate the decompression stops needed for ambient pressure dive profiles using specified breathing gases. It was developed by D.E. Yount and others for use in professional diving and recreational diving. It was developed to model laboratory observations of bubble formation and growth in both inanimate and in vivo systems exposed to pressure. In 1986, this model was applied by researchers at the University of Hawaii to calculate diving decompression tables.
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| - Varying Permeability Model (de)
- Modello a permeabilità variabile (it)
- Varying Permeability Model (en)
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| - The Varying Permeability Model, Variable Permeability Model or VPM is an algorithm that is used to calculate the decompression stops needed for ambient pressure dive profiles using specified breathing gases. It was developed by D.E. Yount and others for use in professional diving and recreational diving. It was developed to model laboratory observations of bubble formation and growth in both inanimate and in vivo systems exposed to pressure. In 1986, this model was applied by researchers at the University of Hawaii to calculate diving decompression tables. (en)
- Das Varying Permeability Model (VPM) ist ein modernes Dekompressionsmodell, das versucht, die Bildung von Mikrogasblasen im Körpergewebe beim Tauchen durch mathematische Simulation zu minimieren. Das Modell wurde Ende der 1990er Jahre entwickelt. Die klassischen Modelle (Haldane, Bühlmann etc.) gehen hingegen davon aus, dass die Mikrogasblasen beim Aufstieg vorhanden sind, und versuchen nur, deren Auswirkungen so gering wie möglich zu halten, so dass es nicht zu einer Dekompressionskrankheit kommt. (de)
- Il modello a permeabilità variabile (Varying Permeability Model o VPM) è un algoritmo di decompressione definito da e usato nella subacquea sportiva e commerciale. È stato definito in seguito all'osservazione della formazione di bolle gassose nei sistemi esposti a pressione. Nel 1986 questo modello è stato applicato dai ricercatori della University of Hawaii per calcolare alcune tabelle di decompressione. (it)
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| - Das Varying Permeability Model (VPM) ist ein modernes Dekompressionsmodell, das versucht, die Bildung von Mikrogasblasen im Körpergewebe beim Tauchen durch mathematische Simulation zu minimieren. Das Modell wurde Ende der 1990er Jahre entwickelt. Es wird davon ausgegangen, dass Mikrogasblasen die Vorstufe für große Blasen sind. Das Modell induziert frühere bzw. tiefere Dekompressionsstopps als die „klassischen“ Algorithmen (z. B. Haldane/Bühlmann-Verfahren), um die Bildung der Blasen im Voraus einzugrenzen. Durch fallenden Umgebungsdruck wird das Körpergewebe mit Inertgas übersättigt. Es entstehen und vergrößern sich Mikrogasblasen, die sich an verschiedenen Stellen im Körper festsetzen können. Dies kann letztlich zur Dekompressionskrankheit führen. Die klassischen Modelle (Haldane, Bühlmann etc.) gehen hingegen davon aus, dass die Mikrogasblasen beim Aufstieg vorhanden sind, und versuchen nur, deren Auswirkungen so gering wie möglich zu halten, so dass es nicht zu einer Dekompressionskrankheit kommt. (de)
- Il modello a permeabilità variabile (Varying Permeability Model o VPM) è un algoritmo di decompressione definito da e usato nella subacquea sportiva e commerciale. È stato definito in seguito all'osservazione della formazione di bolle gassose nei sistemi esposti a pressione. Nel 1986 questo modello è stato applicato dai ricercatori della University of Hawaii per calcolare alcune tabelle di decompressione. Il VPM presume che microscopici nuclei gassosi sia sempre presenti sia nell'acqua che nei tessuti che la contengono. Ogni nucleo più grande di una dimensione critica specifica, relativa alla massima profondità raggiunta, crescerà durante la decompressione (e quindi durante la risalita). Il modello ha lo scopo di minimizzare il volume totale di queste bolle mantenendo la pressione esterna larga e la pressione parziale dei gas inerti respirati bassa durante la decompressione. (it)
- The Varying Permeability Model, Variable Permeability Model or VPM is an algorithm that is used to calculate the decompression stops needed for ambient pressure dive profiles using specified breathing gases. It was developed by D.E. Yount and others for use in professional diving and recreational diving. It was developed to model laboratory observations of bubble formation and growth in both inanimate and in vivo systems exposed to pressure. In 1986, this model was applied by researchers at the University of Hawaii to calculate diving decompression tables. (en)
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