Pulmonary function responses of young and older adults to mixtures of O sub 3 , NO sub 2 and PAN

Journal Article · Mon May 01 00:00:00 EDT 1989 · Toxicology and Industrial Health; (USA)

OSTI ID:5542489

Drechsler-Parks, D M; Bedi, J F; Horvath, S M ^[1]

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1. Univ. of California, Santa Barbara (USA)

The pulmonary function of 32 nonsmokers (eight men and eight women, 18-26 years of age; eight men and eight women, 51-76 years of age) was measured before and after two-hour exposures to (1) filtered air (FA), (2) 0.45 ppm ozone (O3), (3) 0.13 ppm peroxyacetyl nitrate + 0.45 ppm O3 (PAN/O3), (4) 0.60 ppm nitrogen dioxide + 0.45 ppm O3 (NO2/O3), and (5) 0.13 ppm PAN + 0.60 ppm NO2 + 0.45 ppm O3 (PAN/NO2/O3). Subjects alternated 20-minute periods of rest and exercise (ventilation = 25 L/min). Forced vital capacity (FVC) was measured pre-exposure and five-minutes after each exercise period. Forced expiratory volume in one sec (FEV1.0) and forced expiratory flow between 25 and 75 percent of FVC (FEF25-75%) were calculated from the FVC tests. Data were analyzed by 4-factor analysis of variance (sex, age, time period, exposure). The responses of men and women were similar. FA exposure induced no effects. The young subjects' decrements in FVC, FEV1.0 and FEF25-75% became significant (P less than 0.01) after the second exercise period of the O3, NO2/O3 and PAN/NO2/O3 exposures, while the PAN/O3 decrements were significant (P less than 0.01) after the first exercise period. Although PAN/O3 induced significant decrements earlier than the other conditions including O3, the mean pre- to post-exposure decrements for the four conditions including O3 were similar. In contrast, the older subjects had smaller and fewer significant decrements in pulmonary functions. They had significant mean decrements in FVC following the third exercise period of the NO2/O3 and PAN/NO2/O3 exposures, in FEV1.0 after the third exercise period of the PAN/O3 and NO2/O3 exposures, and in FEF 25-75% beginning after the second exercise period of the NO2/O3 exposure.

• OSTI ID: 5542489
• Journal Information: Toxicology and Industrial Health; (USA), Vol. 5:3; ISSN 0748-2337
• Country of Publication: United States
• Language: English

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560300* - Chemicals Metabolism & Toxicology