| Summary: | 碩士 === 國立陽明大學 === 物理治療研究所 === 92 === Taiwan is about two-third its area covered with mountains. Popular tourist spots can take only one to two days to reach an altitude higher than 3,000 meters. However, going to a high altitude rapidly may easily lead to acute mountain sickness (AMS). Severe AMS could lead to death. Hypoxia tests can be used to prevent AMS and intermittent hypoxia training can be used for preacclimatization. However, acute hypoxia symptoms during testing may affect the accuracy of a hypoxia prediction test as well as the success of a hypoxia training. The aim of this study was to investigate the physical characteristics of subjects with acute hypoxia symptoms and their responses of their cardiopulmonary system (CPS) and autonomic nervous system (ANS) during acute hypoxia. This was a single blind, repeated-measure experimental study. Twenty-seven subjects were recruited. They went through the short-term acute hypoxia (SAH) test of 11%O2 at sea level for twenty minutes. Based on the resulted symptoms, the subjects were grouped into the Sickness (S) or the Non-sickness (N) group. The results showed that people with acute hypoxia symptoms had a significantly higher body mass index, lower sympathetic modulation, lower oxygen saturation, and poor breathing efficiency before the SAH test and significantly increased sympathetic activation during the SAH test.
Therefore, we may presume that people who have a higher BMI, and lower sympathetic nervous activity before they was administrated to a hypoxia training program or a hypoxia test, may have more possibility to get acute hypoxia symptoms.
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