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目的通过观察低氧训练前、后受训飞行员血氧饱和度的变化,探讨机体经低氧训练产生间歇性低氧适应的过程以及低氧适应的量化指标。方法以模拟3.5km高空环境低氧吸人前1天为训练前,连续低氧吸入15d次日为训练后,于低氧训练前、后分别记录受训者在模拟7.5km高空环境下脉搏血氧饱和度(SpO_2)随时间的变化情况。结果对受训者经低氧训练前、后在模拟7.5km高空环境下各个时段的SpO_2测定结果进行比较,发现除了第1～5个和第10个时间段的SpO_2差异无统计学意义外(P>0.05),其它各时间段差异均有统计学意义(P<0.05),表明受训者经低氧训练后其SpO_2下降趋势较低氧训练前平缓。结论经模拟3.5km高空环境急性低氧训练后,机体供氧和用氧能力均明显提高,从而产生间歇性低氧适应,SpO_2可作为评定间歇性低氧适应的量化指标之一。
Objective To observe the changes of oxygen saturation of pilots trained before and after hypoxia training to explore the mechanism of intermittent hypoxia adaptation during hypoxia training and to quantify the hypoxia adaptation. Methods One day before hypoxia inhalation (3.5 km altitude) was simulated before training and the other day after continuous hypoxia inhalation (15 days) as training. Before and after hypoxia training, the trainees recorded pulse oximetry Degree (SpO_2) with time changes. Results Compared with the results of SpO_2 measured at different time intervals of 7.5km altitude before and after hypoxia training, there was no significant difference in SpO_2 between the 1st and 5th and 10th time periods > 0.05). The differences in other time periods were statistically significant (P <0.05), indicating that the trainees had a trend of decrease in SpO2 after hypoxia training compared with that before hypoxia training. Conclusion After simulated hypoxia training at altitude of 3.5km, body oxygen supply and oxygen consumption were significantly increased, resulting in intermittent hypoxia adaptation. SpO 2 could be used as a quantitative indicator of intermittent hypoxia adaptation.