Acute Respiratory Effects and Endotoxin Exposure During Wheat Harvest in Northeastern Colorado

Details

• Personal Author:
  Buchan R ; Stallones L ; Viet SM
• Description:
  Acute cross-shift respiratory changes were evaluated for workers at 25 farms in northeastern Colorado during the summer of 1994 wheat harvest. Information on workers' respiratory health, past occupational exposures, and smoking status was obtained. Each worker was asked to rank eight acute symptoms before he or she began harvest work for the day. Spirometry was also performed before work began. Each participant wore a high-flow personal air sampling pump for the full shift. At the end of the workshift, spirometry and ranking of the eight acute symptoms were conducted again. Total dust exposure was determined gravimetrically. Total endotoxin was measured by the Limulus amoebocyte lysate (LAL) assay. The 98 harvest workers included in the study ranged in age from 18 to 80. Ten percent of the workers had moderate airway obstruction, as indicated by the pre-shift spirometry test results. Fifty percent of the workers were current or ex-smokers. Despite an unusually poor harvest, total dust exposures ranged from 0.09 to 15.33 mg/m3 (geometric mean 0.83 mg/m3), with 8 percent of workers exposed above the American Conference of Government Industrial Hygienists (ACGIH) threshold limit value (TLV) of 4 mg/m3. Total endotoxin exposures ranged from 4.4 to 744.4 EU/m3 (geometric mean 54.2 EU/m3), with 33 percent of workers exposed above 90 EU/m3, the level suggested as a threshold for acute mucous membrane irritation and pulmonary change among cotton workers. Sixty percent of workers experienced a cross-shift change in at least one respiratory symptom. The respiratory index (sum of cross-shift changes in the eight acute respiratory symptoms) was significantly correlated with both total dust and endotoxin exposure. Cross-shift changes in the spirometric variables were associated with smoking status, age, presence of airway obstruction, and history of chronic respiratory symptoms, but not with dust or endotoxin exposure. Peak expiratory flow rate was found to decrease over the workshift in a manner similar to that experienced by cotton workers. [Description provided by NIOSH]
• Subjects:
  Agriculture Dust Endotoxins Environmental Monitoring Farmers Lung Occupational Exposure Occupational Health Respiratory Function Tests Respiratory System Respiratory Tract Diseases Safety Smokers

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• Keywords:
  Acute-exposure Agricultural-industry Agricultural-workers Airway-obstruction Dust-exposure Dusts Exposure-assessment Exposure-levels Occupational-exposure Pulmonary-function Pulmonary-system-disorders Respiratory-system-disorders Smoking Spirometry Worker-health Workers

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• ISSN:
  1047-322X
• Document Type:
  Text
• Funding:
  Grant
• Genre:
  Journal Article
• Place as Subject:
  Colorado ; OSHA Region 8
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Volume:
  16
• Issue:
  6
• NIOSHTIC Number:
  nn:20029786
• Citation:
  Appl Occup Environ Hyg 2001 Jun; 16(6):685-697
• Federal Fiscal Year:
  2001
• Performing Organization:
  Colorado State University, Fort Collins, Colorado
• Peer Reviewed:
  True
• Start Date:
  19940701
• Source Full Name:
  Applied Occupational and Environmental Hygiene
• End Date:
  20050630
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:d679ff8c190340cebe9a1ed7ad89731ef7f865962a13986fbdeb60ff26e47da5ab6d16abef962ff2f3a0adfef31543755ccb1a23c915881f86dd0413891153bf
• Download URL:
  https://stacks.cdc.gov/view/cdc/190696/cdc_190696_DS1.pdf
• File Type:
  [PDF - 393.37 KB ]