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目的 探讨在9000m高空跳伞时缺氧防护的生理指标要求。方法 4名健康男性被试者使用供氧防护装备,在低压舱内上升至9000m,然后模拟即刻开伞的降落轨迹降至2000m,记录各项物理参数和生理指标。结果 从9000m降至2000m的平均时间为23min 35s,此期间的累计耗氧量为:静止时平均47.9L,有轻度运动负荷时平均63.0L。心电图和血氧饱和度变化表明供氧浓度能满足生理要求。供氧系统呼吸气阻力为2.36～4.22kPa。结论 现有供氧防护装备经改进后能满足9000m跳伞即刻开伞中的缺氧防护要求。
Objective To explore the physiological indicators of hypoxia protection at the altitude of 9000m. Methods Four healthy male subjects were given oxygen protection equipment and risen to 9000m in the low-pressure cabin. The landing trajectory of the simulated parachute was reduced to 2000m and the physical parameters and physiological indexes were recorded. Results The mean time from 9000 m to 2000 m was 23 min 35 s. The cumulative oxygen consumption during this period was 47.9 L at rest and 63.0 L at light exercise load. Changes in ECG and oxygen saturation indicate that oxygen concentration can meet physiological requirements. Breathing resistance of oxygen system is 2.36 ~ 4.22kPa. Conclusion The existing oxygen protection equipment has been improved to meet the requirements of hypoxia protection in the immediate parachuting of 9000m skydiving.