Effects of spirometer temperature on FEV1 shift changes.
Hankinson-JL; Keimig-DG; Kinsely-KB; Castellan-RM
Cotton dust: proceedings of the Tenth Cotton Dust Research Conference, beltwide cotton research conferences, January 8-9, 1986, Las Vegas, Nevada. Jacobs RR, Wakelyn PJ, eds. Memphis TN: The National Cotton Council of America, 1986 Apr; :116-118
Effects of ambient (spirometer) temperature on forced expiratory volume in 1 second (FEV1) changes over a work shift under actual field conditions were studied by reviewing data from 1,899 cotton workers who completed spirometric examinations both before and after a work shift as a part of an epidemiological survey. A total of 302 (15.9 percent) spirometric examinations were performed when the temperature over the work shift increased by more than 3 degrees-C. FEV1 values were calculated for each subject with a constant body temperature pressure saturated (BTPS) correction factor and a dynamic BTPS correction factor. When a constant BTPS factor was used, an increasing number of subjects were falsely classified as having significant (5 percent) decrements in FEV1 over the work shift when the work shift temperature increased. With a temperature difference over 3 degrees-C, the proportion of subjects with a greater than 5 percent decrement using the constant BTPS correction factor was 125/302, compared to 94/302 using the dynamic BTPS correction factor. The authors conclude that an elevated number of subjects may be misclassified in terms of significant decrements in FEV1 over the work shift when a constant BTPS correction factor is used.
Spirometry; In-vivo-studies; Temperature-effects; Physiological-response; Textile-workers; Pulmonary-function-tests; Cotton-dust; Humans
Cotton dust: proceedings of the Tenth Cotton Dust Research Conference, beltwide cotton research conferences, January 8-9, 1986, Las Vegas, Nevada