caa a22 4500 46904893X CHVBK 20180323132824.0 cr unu---uuuuu 170328e19920101xx s 000 0 eng 10.1007/BF00164755 doi (NATIONALLICENCE)springer-10.1007/BF00164755 Pulmonary responses of asthmatic and normal subjects to different temperature and humidity conditions in an environmental chamber [Elektronische Daten] [William Eschenbacher, Thomas Moore, Thomas Lorenzen, John Weg, Kenneth Gross] Determining the possible adverse health effects of air pollutants can be complicated by differences in the environmental conditions of temperature and humidity. To evaluate the potentially confounding effects of differences in temperature and humidity, we exposed 8 normal male subjects and 8 male subjects with asthma to the extremes in temperature and humidity that could be maintained in an environmental chamber. We performed serial pulmonary function tests for these subjects before and during 6 hr exposure periods on 5 separate occasions: cold, dry (10°C, 10% relative humidity); cold, humid (10°C, 50% relative humidity); normal ambient (22°C, 40% relative humidity); hot, dry (37°C, 15% relative humidity); and hot, humid (37°C, 60% relative humidity). The exposure period included a 12 min exercise on a cycle ergometer. We found no significant change in spirometry, airways resistance, or diffusing capacity for either group of subjects at rest alone over the 6 hr period of exposure for any exposure condition. However, there were changes in spirometry and airways resistance as a result of the 12 min period of exercise. The subjects with asthma had significant decreases in forced expiratory volume in 1 sec (FEV1) (20-21%) and increases in specific airways resistance when exercising in conditions of cold and dry, cold and humid, and hot and dry. The normal subjects had an average increase in FEV1 of approximately 6% when exercising in the hot and humid conditions. We found significant correlations for the changes in FEV1 with the water content of the exposure conditions for both groups of subjects. We also found that the work performance (expressed as the external work performed divided by the oxygen consumed) was decreased for the subjects in both groups at the conditions of the higher temperature (37°C) compared with the lower temperature (10°C). These results confirm that controlling for the conditions of temperature and humidity is essential in chamber studies, field studies, or epidemiologic evaluations determining the adverse effect of an air pollutant. Springer-Verlag, 1992 Air pollution nationallicence Heat stress nationallicence Exercise testing nationallicence Bronchoconstriction nationallicence Eschenbacher William Pulmonary Function Laboratory F988, The Methodist Hospital, 6565 Fannin, 77030, Houston, TX, USA aut Moore Thomas Biomedical Science and Mathematics Departments, General Motors Research Laboratories, Warren, MI, USA aut Lorenzen Thomas Biomedical Science and Mathematics Departments, General Motors Research Laboratories, Warren, MI, USA aut Weg John Pulmonary and Critical Care Medicine, University of Michigan Medical Center, Ann Arbor, MI, USA aut Gross Kenneth Biomedical Science and Mathematics Departments, General Motors Research Laboratories, Warren, MI, USA aut Lung Springer-Verlag 170/1(1992-01-01), 51-62 0341-2040 170:1<51 1992 170 408 https://doi.org/10.1007/BF00164755 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00164755 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Eschenbacher William Pulmonary Function Laboratory F988, The Methodist Hospital, 6565 Fannin, 77030, Houston, TX, USA aut NATIONALLICENCE 700 1- Moore Thomas Biomedical Science and Mathematics Departments, General Motors Research Laboratories, Warren, MI, USA aut NATIONALLICENCE 700 1- Lorenzen Thomas Biomedical Science and Mathematics Departments, General Motors Research Laboratories, Warren, MI, USA aut NATIONALLICENCE 700 1- Weg John Pulmonary and Critical Care Medicine, University of Michigan Medical Center, Ann Arbor, MI, USA aut NATIONALLICENCE 700 1- Gross Kenneth Biomedical Science and Mathematics Departments, General Motors Research Laboratories, Warren, MI, USA aut NATIONALLICENCE 773 0- Lung Springer-Verlag 170/1(1992-01-01), 51-62 0341-2040 170:1<51 1992 170 408 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer