Influence of exercise and heat stress on pulmonary function during ozone exposure

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Abstract
The effects of a 2 h ozone (0.5 ppm) exposure in 14 nonsmoking males under 4 envirionmental conditions (WBGT (wet bulb-globe temperature index) = 64.4, 80.0, 85.2 and 92.0.degree. F) was studied. The subjects were divided into 2 groups, A (n = 8) and B (n = 6). Thirty minutes of exercise at 40% .ovrhdot.VO2 max [maximum oxygen volume] was performed from 60-90 min for group A and 30-60 min for group B. Pulmonary function changes, determined throughout exposure, were greatest immediately after exercise in both groups. Few changes occurred before the exercise period. The decrease in FVC [forced vital capacity] (826 ml) and FEV1.0 [forced expiratory volume] (937 ml) following exercise was more than twice as large as the decrement seen at end exposure (388 and 423 ml, respectively). Measures of maximum expiratory flow (FEF [forced expiratory flow] 25-75%, FEF 50%, FEF 75%) showed similar reductions. In many cases, reversal of these changes occurred during the remainder of the exposure period. The greatest decrease in FVC occurred when heat and ozone exposures were combined (WBGT = 92.0.degree. F). The effects of ozone are probably most severe immediately after exercise and heat stress may modify the overall effect of ozone on pulmonary function.

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