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Related Experiment Videos

Effects of steady-state and variable ozone concentration profiles on pulmonary function.

M J Hazucha1, L J Folinsbee, E Seal

  • 1Department of Medicine, School of Medicine, University of North Carolina, Chapel Hill 27599-7310.

The American Review of Respiratory Disease
|December 11, 1992
PubMed
Summary

Ozone exposure dose impacts lung function differently depending on concentration patterns. Even with the same total ozone dose, varying exposure profiles significantly altered spirometric responses in healthy adults.

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Area of Science:

  • Environmental Health
  • Pulmonary Physiology
  • Toxicology

Background:

  • Ambient ozone (O3) concentration profiles vary, often peaking in the afternoon.
  • Recent research suggests ozone concentration is a critical factor in exposure dose estimation (O3 x time x ventilation).

Purpose of the Study:

  • To test if a consistent ozone exposure dose induces similar spirometric responses regardless of concentration pattern.
  • To investigate the impact of different ozone exposure profiles on lung function.

Main Methods:

  • 23 healthy males (20-35 years) underwent 8-hour exposures to air, steady-state 0.12 ppm O3, and a triangular O3 pattern (0-0.24 ppm).
  • Subjects exercised for 30 minutes each hour, maintaining minute ventilation (VE) around 40 L/min.
  • Randomized exposure order with at least 7 days between exposures.

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Main Results:

  • Spirometric response patterns differed significantly between air and both ozone exposures, and between the two ozone profiles (p<0.05 for FEV1).
  • In the triangular exposure, peak O3 occurred at 4 hours, but maximum FEV1 decrement (10.2%) was observed at 6 hours.

Conclusions:

  • Ozone exposure dose, when delivered via different concentration patterns, does not elicit the same spirometric response.
  • Lung function decrements are influenced by the dynamics of ozone concentration, not just the total dose.