Comparison of Pulmonary Responses of Asthmatic and Nonasthmatic Subjects Performing Light Exercise While Exposed to a Low Level of Ozone

Abstract

To determine if asthmatic subjects (ASTH, n = 17) experience greater O₃ induced pulmonary decrements than nonasthmatic subjects (NONA, n = 13), both groups were exposed for 7.6 h to both clean air and 0.16 ppm 03. Exposures consisted of seven 50-min periods of light exercise (VE = 14.2 and 15.3 l/min/m² for ASTH and NONA, respectively), each followed by 10 min rest. A 35-min lunch period followed the third exercise. Following 03 exposure, decrements in forced expiratory volume in one second (FEV₁) and FEV₁ divided by forced vital capacity (FVC), corrected for air exposure, for ASTH

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