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Normobaric hypoxic conditions corresponding to an altitude of 3,000 m (F i O2 = 14.5%) were simulated by diluting ambient air with nitrogen via a mixing chamber, with the dilution being constantly controlled by a P o 2 probe (Alti-Trainer 200, Sport and Medical Technology).ormobaric hypoxic conditions corresponding to an altitude of 3,000 m (F i O2 = 14.5%) were simulated by diluting ambient air with nitrogen via a mixing chamber, with the dilution being constantly controlled by a P o 2 probe (Alti-Trainer 200, Sport and Medical Technology).
Acute hypoxia is characterised by impaired cognitive performance and sometimes a loss of consciousness. If there is a cabin rupture or other cabin depressurisation that occurs extremely quickly, hypoxia can occur within a few seconds, especially if cabin pressure altitude is higher than 7,500 m (about 25,000 ft).