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Small Airway Dysfunction and Abnormal Exercise Responses. A Study in Coal Miners.

Edward L Petsonk¹, Robert C Stansbury¹, Lu-Ann Beeckman-Wagner²

¹1 Section of Pulmonary and Critical Care Medicine, Department of Medicine, West Virginia University School of Medicine, Morgantown, West Virginia; and.

Annals of the American Thoracic Society

|April 14, 2016

Summary

Small airway dysfunction in coal miners significantly impairs exercise ventilation and reduces oxygen consumption, highlighting the importance of cardiopulmonary exercise testing for diagnosing exercise intolerance in dust-exposed workers.

Keywords:

cardiopulmonary exercise test pneumoconiosis respirable dust small airways

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Area of Science:

Occupational Health
Pulmonary Medicine
Exercise Physiology

Background:

Coal mine dust exposure is linked to lung function decline through various mechanisms.
The specific impact of small airway dysfunction on exercise physiology in coal miners remains unclear.

Purpose of the Study:

To investigate the effects of small airway dysfunction on exercise physiology in coal miners.
To determine the relationship between small airway dysfunction and exercise intolerance.

Main Methods:

Twenty coal miners underwent spirometry, single-breath diffusing capacity, chest CT, and cardiopulmonary exercise testing.
Participants were categorized based on the presence or absence of small airway dysfunction.

Main Results:

Miners with small airway dysfunction exhibited higher maximum voluntary ventilation utilization and ventilatory equivalents during submaximal exercise.
Inefficient ventilation was strongly correlated with small airway dysfunction, independent of FEV1 or diffusing capacity.
Miners with small airway dysfunction showed a 27% reduction in oxygen consumption at peak exercise.

Conclusions:

Small airway dysfunction contributes significantly to ventilation inefficiency during exercise in coal miners.
Cardiopulmonary exercise testing is crucial for identifying exercise intolerance causes, especially in dust-exposed individuals with subtle resting lung function abnormalities.