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以10名健康男青年为被试者,分别于静坐及轻、中度(200、600Kg.m.min~(-1))体力活动条件下观察了外加吸气阻力负荷所引起的面罩腔压力(P)及外呼吸功(w)变化;并采用辨别阈梯级(JND)与多级估量量表(MES)相结合的方法测出了不同体力负荷条件下的呼吸阻力感觉阈限。结果表明:(1)面罩腔压力与外呼吸功分别与呼吸感觉量值呈高度相关关系(P<0.01)但又以压力指标相关程度更为密切,故选用面罩腔压力波动幅度()作为反映呼吸感觉程度的客观生理指标较外吸气功率更为适宜。(2)体力负荷与外加吸气阻力对面罩腔压力、外呼吸功及感觉量值均具有协同的增强效应。(3)随体力负荷的增强,呼吸阻力感觉的阈限值也相应升高。在轻度体力负荷下能引起轻、中度呼吸阻力感觉的面罩腔压力波动幅度阈限值分别为(60、100mmH_2O);在中度体力负荷下,则分别为80、130mmH_2O。述结果对制订航空供氧装备附加呼吸阻力生理学标准具有实际意义。
A total of 10 healthy young men were enrolled in this study. The mask cavity pressure caused by external resistance load was observed under meditation and light and moderate physical activity (200,600 Kg.m.min -1) (P) and external respiration (W). The sensory threshold of respiration resistance under different physical exertion load was measured by the method of discriminant threshold step (JND) and multistage assessment scale (MES). The results showed that: (1) the pressure in the mask cavity and the external respiration power were highly correlated with the respiratory sensory values (P <0.01), but the correlation between the pressure indexes was more close The objective physiological index of respiratory sensation is more suitable than the external inspiration power. (2) Physical load and external inspiratory resistance have synergistic enhancement effects on face mask pressure, external respiration and sensory values. (3) With the increase of physical load, the threshold value of respiratory resistance sensory also increased accordingly. The threshold limits of the pressure fluctuations of the mask cavity that can cause mild and moderate respiratory resistance sensation under light physical load are (60,100mmH2O) and 80,130mmH2O respectively under moderate physical load. The results of the development of aviation oxygen equipment additional respiratory resistance physiological criteria of practical significance.