Matthew W Nonnenmann1, David Gimeno Ruiz de Porras2, Jeffrey Levin3, David Douphrate2, Vijay Boggaram3, Joshua Schaffer4, Michael Gallagher5, Madeleine Hornick6,7, Stephen Reynolds4. 1. Department of Occupational and Environmental Health, The University of Iowa, Iowa City, Iowa. 2. Department of Epidemiology, Human Genetics and Environmental Sciences, Southwest Center for Occupational and Environmental Healt, The University of Texas Health Science Center at Houston School of Public Health, San Antonio, Texas. 3. Department of Occupational Health Sciences, UT Health Northeast, Tyler, Texas. 4. Department of Cellular and Molecular Biology, UT Health Northeast, Tyler, Texas. 5. Department of Environmental and Radiological Health Sciences, Colorado State University, Fort Collins, Colorado. 6. 3M Purification, Inc., Stafford Springs, Connecticut. 7. Liberty Mutual Insurance, Portland, Oregon.
Abstract
BACKGROUND: Inhalation exposure to organic dust causes lung inflammation among agricultural workers. Due to changes in production and work organization, task-based inhalation exposure data, including novel lung inflammation biomarkers, will inform exposure recommendations for dairy farm workers. METHODS: Linear regression was used to estimate the associations of airborne exposure to dust concentration, endotoxin, and muramic acid with pulmonary outcomes (i.e., FEV1 , exhaled nitric oxide). Logistic regression was used to estimate associations with self-reported pulmonary symptoms. RESULTS: Mean exposure concentration to inhalable dust, endotoxin, and muramic acid were 0.55 mg/m3 , 118 EU/m3 , and 3.6 mg/m3 , respectively. We found cross-shift differences for exhaled nitric oxide (P = 0.005) and self-reported pulmonary symptoms (P = 0.008) but no association of exposure with respiratory outcomes. CONCLUSIONS: Inhalation exposures during parlor tasks, which were lower than previously reported and were not associated with cross-shift measures of pulmonary health among dairy workers. Modern milking parlor designs may be contributing to lower inhalation exposure. Am. J. Ind. Med. 60:255-263, 2017.
BACKGROUND: Inhalation exposure to organic dust causes lung inflammation among agricultural workers. Due to changes in production and work organization, task-based inhalation exposure data, including novel lung inflammation biomarkers, will inform exposure recommendations for dairy farm workers. METHODS: Linear regression was used to estimate the associations of airborne exposure to dust concentration, endotoxin, and muramic acid with pulmonary outcomes (i.e., FEV1 , exhaled nitric oxide). Logistic regression was used to estimate associations with self-reported pulmonary symptoms. RESULTS: Mean exposure concentration to inhalable dust, endotoxin, and muramic acid were 0.55 mg/m3 , 118 EU/m3 , and 3.6 mg/m3 , respectively. We found cross-shift differences for exhaled nitric oxide (P = 0.005) and self-reported pulmonary symptoms (P = 0.008) but no association of exposure with respiratory outcomes. CONCLUSIONS: Inhalation exposures during parlor tasks, which were lower than previously reported and were not associated with cross-shift measures of pulmonary health among dairy workers. Modern milking parlor designs may be contributing to lower inhalation exposure. Am. J. Ind. Med. 60:255-263, 2017.
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