关于复合呼吸机械负荷生理—心理效应的观察与分析

实验目的 使用呼吸防护装备(RPE)时,由于外加死腔(V_(ADS))及外加联合呼、吸气阻力(R_(I E))增大,均可能对使用者造成一定呼吸机械负荷,产生一定生理-心理影响。关于V_(ADS)或R_(I E)单独作用的影响,已有不少报

OBSERVATIONS AND ANALYSIS OF PHYSIOLOGICAL AND PSYCHOLOGICAL EFFECTS DURING COMBINED RESPIRATORY MECHANICAL LOADING

The combined actions of added external dead space (VADS) and inspira-tory resistance (RI) on respiratory pattern,ventilation and respiratory discomfort were studied in 12 healthy male adults under sitting conditions.The results found were:(1)VADS and RI acted synergically in increasing the oral inspiratory pressure amplitude; (PI) and external inspira.ory work rate (WI),the more severe the combined mechanical stress,the more prominent this synergic interaction.(2) No matter what the relative proportions between VADS and RI were,there was a close correlation between the scaling values representing respiratory discomfort caused by loading and the magnitudes of the combined mechanical loads expressed as either P1 or WI in all conditicns studied,(3) VADS of 100-600 ml did not impair the ability of the human respiratory system to regulate PZCO2 and VI during res stive loading,except for resetting the regulated PCO2 level.The significance of our present findings for revising the physiological standard of respiratory protective device is discussed.