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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).
This kind of periodic oxygen deprivation -- known as hypoxia -- is the fundamental characteristic of obstructive sleep apnea. When a person has OSA, his or her airway collapses during sleep, depriving the body of oxygen for a short period of time. Breathing is interrupted, and the levels of oxygen in the blood drop.