模拟36.5m氮氧饱和潜水26昼夜对人体肺通气量和摄氧量的影响

EFFECT ON PULMONARY VENTILATION AND OXYGEN UPTAKE OF HUMAN BODY DURING SIMULATED N_2-O_2 SATURATION DIVING AT A DEPTH OF 36.5m FOR 26 DAYS

本文报道了7名受试者饱和暴露于36.5m氮氧条件下26昼夜及60-75m空气巡潜时肺通气量和摄氧量的变化。结果表明:1.高压条件下,影响人体肺通气功能最重要的因素是气体密度升高所致的呼吸阻力变大,因此,最大呼气、吸气流速、最大通气量和时间肺活量均有显著的下降。2.在高压暴露时,由于体力负荷的通气量有显著减少,所以呼吸困难指数有明显的增加。3.高压暴露期间的静息摄氧量和二氧化碳产生量与海平对照值接近,而体力负荷的摄氧量有增加的趋势,体力负荷后第3分钟的摄氧量有显著增加。这表明体力负荷时的氧债量增加了。

The present work has studied that the effect of the simulated N2-O2 saturation diving at a depth of 36.5m for 26 days and air excursion diving at depths of 60, 70 and 75m on the pulmonary ventilation and oxygen uptake. The results were as follow: ( 1 ) The most important factor of the effect on pulmonary ventilatory function was the increase of respiratory resistance which was resulted from the ascent of the gas density under high pressure, therefore maximal expiratory and inspiratory flow rates, maximal voluntary ventilation and timed vital capacity were declined significantly.( 2 ) During the exposure to the high pressure, the exercise ventilation was declined significantly, thus the dyspnoeic index was increased obviously.(3) During the period of hyperbaric N2-O2 exposure, the oxygen uptake and the carbon dioxide elimination at rest were close to sea level, and the exercise oxygen uptake tended to increase, and the oxygen uptake of the third minute after exercise was increased significantly. Then it indicated that the oxygen debt was increased during exercise.