title: Response to ozone in volunteers with chronic obstructive pulmonary disease.
abstract: Twenty-eight volunteers with chronic obstructive pulmonary disease were exposed to 0.0, 0.18, and 0.25 ppm ozone in purified air for 1-hr periods with light intermittent exercise, with exposure conditions presented in random order at 1-month intervals. No statistically significant changes attributable to ozone were found in forced expiratory performance or percent oxyhemoglobin (measured near the beginning and end of each exposure). No ozone-related changes in clinical status were found by interviews that included the time for 1 wk before to 1 wk after each exposure, except that a moderate increase in lower respiratory symptoms was reported by nonsmokers in 0.18 ppm exposures only. Thus, a slight decrement in hemoglobin saturation with ozone exposure (reported in two previous studies of chronic obstructive pulmonary disease subjects) may not be a common occurrence under typical ambient exposure conditions.
mesh_terms: D000368:Aged; D001273:Atmosphere Exposure Chambers; D005260:Female; D006339:Heart Rate / Q000187:drug effects; D006454:Hemoglobins / Q000032:analysis; D006801:Humans; D008173:Lung Diseases, Obstructive / Q000503:physiopathology*; D008297:Male; D008875:Middle Aged; D010126:Ozone / Q000633:toxicity*; D005082:Physical Exertion; D012123:Pulmonary Ventilation / Q000187:drug effects; D012907:Smoking
chemical_list: D006454:Hemoglobins; D010126:Ozone