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Diffstat (limited to 'Documentation/user-manual.txt')
| -rw-r--r-- | Documentation/user-manual.txt | 17 |
1 files changed, 13 insertions, 4 deletions
diff --git a/Documentation/user-manual.txt b/Documentation/user-manual.txt index 2d6468ed8..c6a4ff3bc 100644 --- a/Documentation/user-manual.txt +++ b/Documentation/user-manual.txt @@ -2430,10 +2430,19 @@ http://www.tek-dive.com/portal/upload/M-Values.pdf[Understanding M-values by Eri Since the colours of the heat map are not affected by the gradient factor(s), the heat map is also applicable when using the VPM-B decompression model. -The image below shows the profiles and heat maps for two dives to about 45m. -The inert gas pressures in the fast tissues -rise much more rapidly, going through the sequence from light blue to light green and orange. -In contrast, the slow tissues accumulate inert gas at a much slower rate. +The image below compares the profiles and heat maps for two planned decompression dives to 60m: +the first using the Bühlmann decompression model, the second using the VPM-B decompression model. +Both profiles have the same total decompression time, but the VPM-B model requires deeper stops early in the acent phase. + +In both profiles, the inert gas pressures in the faster tissues rise much more rapidly than the slower tissues during +the descent and bottom phase, with the colors transitioning from light blue through blue and purple to black. +Similarly, the inert gas pressure in the fast tissues reduces more rapidly than the slow tissues at each decompression stop, +with colors transitioning from red, orange and yellow to green and black. + +The comparison of the two profiles and heatmaps shows that by including deep stops, the oversaturation gradient in the +faster tissues early in ascent phase is reduced. +However, on-gassing of slower tissues continues during the deep stops, which leads to greater oversaturation gradient +in slower tissues at the end of the dive. image::images/tissueHeatmap.jpg["Figure: Inert gas tissue pressure heat-map",align="center"] =================================================================================== |