Comparison of normobaric hypoxia and hypoxic hypoxia protocol on human performance and physiology

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When unexpected situations such as oxygen system failure or loss of cabin pressure occur, a pilot may suffer hypoxia. Without early recognition of hypoxia symptoms and prompt corrective measures, in-flight hypoxia could affect cognition and judgment, even jeopardize flight safety. Hypoxia symptoms are determined by inherent tolerance, among other factors.It is believed that “hypoxia signature”, aconstellation of hypoxia symptoms, is unique for each individual. To familiarize with hypoxia symptoms, all military pilots in Taiwan have to undergo hypoxia awareness training by exposing themselves to simulated hypoxia environment in altitude chamber. This hypobaric hypoxia (HH) training protocol has the potential danger of decompression sickness and barotrauma. Alternatively, normobaric hypoxia (NH) training has been developed involving breath low concentration of oxygen at sea level. NH is safer, more economical andtime saving. However, there’s no conclusion as to whether NH protocol can faithfully imitate altitude hypoxia, as represented by HH protocol currently implemented in many countries as the mainstay of hypoxia awareness training. The purpose of this study is to compare the physiological responses, performances and hypoxia symptoms between HH and NH hypoxia awareness training protocol.

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