Acute Pulmonary Function Response to Ozone in Young Adults As a Function of Body Mass Index
Source: Inhalation Toxicology, Volume 19, Number 14, November 2007 , pp. 1147-1154(8)
Publisher: Informa Healthcare
Abstract:Recent studies have shown enhanced responsiveness to ozone in obese mice. Adiposity has not been examined as a possible modulator of ozone response in humans. We therefore examined the relationship between body mass index and the acute spirometric response to ozone (O3) exposure among 197 nonasthmatic young adults (aged 18-35 yr) studied in our human exposure facility from 1992 to 1998. Each subject had been exposed to 0.42 ppm O3 for 1.5 h with intermittent exercise designed to produce a minute ventilation of 20 L/min/m2 body surface area (BSA). Spirometry (pulmonary function) was measured pre- and immediately postexposure to determine acute ozone-induced changes. The decrement in forced expiratory volume in 1s (ΔFEV1) as percent of baseline was significantly correlated with BMI, r = -0.16, p = .03, with a slightly stronger correlation in women (n = 75), r = -0.22, p = .05, and no significant correlation in men. BMI had a greater range in women than in men in our study. In women greater ozone-induced decrements were seen in overweight (BMI > 25 kg/m2) than in normal weight (BMI 18.5 to 25 kg/m2), and in normal weight than in underweight (BMI < 18.5 kg/m2) for all spirometric variables considered (p trend ≤ .022). Although our population studied was predominantly normal weight, we found that higher body mass index may be a modest risk factor for adverse pulmonary effects associated with ozone exposure, especially for women.
Document Type: Research Article
Affiliations: 1: Center for Environmental Medicine, Asthma and Lung Biology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA 2: National Health and Environmental Effects Research Laboratory, Human Studies Division, U.S. Environmental Protection Agency, Chapel Hill, North Carolina, USA 3: Division of Intramural Research, Department of Health and Human Services, National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, North Carolina, USA
Publication date: November 1, 2007