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By Professor Dr. med Albert A. Bühlmann (auth.)

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Comparisons Between Decompression Using ZH-y2 29 The experiments in Zurich indicate that, during short exposures to oxyhelium in the range 21-26 bar, a rate of decrease in pressure of 3-4 bar/min is tolerated well approaching the first step. This rate is only possible, however, in a suitably equipped pressure chamber. 6. Rate of ascent to the first level in bar/min. 0bar/min for each of the compartments 6 and 7, and of1 bar/min for each of the compartments 8-16. 0 bar/min is usually not possible for technical reasons, and this rate may therefore be recommended for all hyperbaric exposures.

Pure oxygen was breathed through a full-face mask. During the experiments with air the temperature of the chamber varied between 21 o and 22 oc, and with helium, between 28° and 30 oc. 25 could be evaluated. For 10 min every hour 80 W was performed on a bicycle ergometer. Because the pressure of the inert gas may exceed the tolerated value, at the end of the decompression certain halfvalue times, corresponding to the breathing gas and duration of exposure, are critical. Table 6 presents information regarding exposure times and breathing gases.

1 bar should be maintained. 3 bar have proved successful. 3 Comparisons Between Decompression Using ZH-L12 and the US Navy and Royal Navy Tables After Dives with Air[22, 26] For short dives with air as the breathing gas, which interest amateur divers, the ZHL12 systems gives decompression times and steps similar to those of the US Navy and Royal Navy tables. The characteristic differences are evident in dives with a longer stay under water or at greater depths, that is on the border between conventional and exceptional dives with air.

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