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Predictors of longitudinal changes in pulmonary function among swine confinement workers.

S Kirychuk1, A Senthilselvan, J A Dosman

  • 1Centre for Agricultural Medicine and Department of Medicine, Saskatoon, Canada. Kirychuk@sask.usask.ca

Canadian Respiratory Journal
|March 10, 1999
PubMed
Summary

Pulmonary function decline in swine workers is predicted by changes within a work shift and endotoxin exposure. These findings highlight the importance of workplace air quality for respiratory health in agricultural settings.

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Area of Science:

  • Occupational Health
  • Environmental Medicine
  • Pulmonology

Background:

  • Swine confinement workers face occupational exposures that may impact respiratory health.
  • Longitudinal studies are needed to understand the progression of lung function decline in this population.

Purpose of the Study:

  • To identify predictors of changes in lung function over time among swine confinement workers.
  • To investigate the role of indoor air quality, specifically endotoxin levels, in respiratory health decline.

Main Methods:

  • A longitudinal study followed 42 swine confinement workers over a five-year period.
  • Pulmonary function was assessed at baseline and follow-up, including across-shift measurements.
  • Indoor air quality parameters, including airborne dust, gases, and endotoxins, were measured.

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Main Results:

  • A significant decrease in forced expiratory volume in 1 second (FEV1) and forced vital capacity (FVC) was observed annually.
  • Baseline across-shift changes in FEV1 and FVC predicted the rate of annual decline.
  • Higher endotoxin levels in swine barns were a significant predictor of annual FEV1 decline, after adjusting for confounders.

Conclusions:

  • Work-shift related pulmonary function changes are important predictors of long-term lung function decline in swine workers.
  • Endotoxin exposure in swine confinement environments may contribute to the annual decline of FEV1.