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作者从学生中挑选15名不吸烟健康男青年(20～25岁),分成A、B、C三组,每组5人,按随机次序呼吸过滤空气或含0.6ppmNO_2的过滤空气2小时。接触NO_2至少间隔一周,在接触NO_2 2小时过程中,每组在45%最大需氧容量下进行运动试验。A组运动15分钟,B组30分钟,C组在0～15、30～45、60～75、90～105分时各运动15分钟,总计60分钟。每次接触试验前后30分钟进行临床胸部检查、肺功能试验和症状询问。测定指标有:代谢、心输出量、血压、心率、呼吸气体中CO_2和O_2、静脉血中CO、肺扩散容量(D_(Lco))、最大肺活量(FVC)、1秒钟最大呼气量(FEV_(1.0))、深吸气量(IC)、补呼气
The authors selected 15 non-smoking healthy male youths (20-25 years old) from the students and divided them into three groups A, B and C, each with 5 persons. Breathing filtered air or filtered air containing 0.6ppm of NO 2 in random order for 2 hours. Exposure to NO 2 was carried out at least one week apart. During the 2-hour exposure to NO 2, each group was tested for exercise at a maximum aerobic capacity of 45%. Group A exercise for 15 minutes, Group B for 30 minutes, Group C at 0-15,30,45,60 to 75,90 to 105 points for 15 minutes of exercise, a total of 60 minutes. Thirty minutes before and after each exposure test, clinical chest examinations, pulmonary function tests and symptom inquiries. The indexes of measurement were: metabolism, cardiac output, blood pressure, heart rate, CO_2 and O_2 in respiratory gas, CO in venous blood, D_ (Lco), maximum vital capacity (FVC) FEV_ (1.0)), deep inspiration (IC), fill breath