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Lung function studies before and after a work shift.

R G Love

    British Journal of Industrial Medicine
    |May 1, 1983
    PubMed
    Summary
    This summary is machine-generated.

    Coal miners experienced significant lung function decline, particularly on night shifts. These changes were linked to shift timing, not dust exposure or smoking habits.

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    Area of Science:

    • Occupational Health
    • Respiratory Physiology
    • Environmental Medicine

    Background:

    • Shift work is common in mining industries.
    • Occupational dust exposure can impact lung function.
    • Diurnal variations in physiological parameters are known.

    Purpose of the Study:

    • To investigate the impact of shift work timing on coal miners' lung function.
    • To determine if lung function changes are related to respirable dust exposure.
    • To compare diurnal lung function variations between shift workers and non-exposed controls.

    Main Methods:

    • Lung function tests (FEV1, Vmax50, Vmax25) were performed before and after shifts in coal miners.
    • Respirable dust exposure levels were measured.
    • Control groups of hospital nurses and office workers were included for comparison.

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  • Data were analyzed to assess the relationship between lung function changes, shift time, and dust exposure.

    • Main Results:

    • Night-shift coal miners showed significant lung function decrements (FEV1, Vmax50, Vmax25) compared to other shifts.
    • Afternoon-shift workers had smaller reductions, while morning-shift workers showed minimal changes.
    • No significant relationship was found between dust exposure and lung function changes within a shift.
    • Control groups did not exhibit the same shift-related lung function variations.

    Conclusions:

    • Coal miners' lung function undergoes significant diurnal changes influenced by shift timing, independent of dust exposure or smoking.
    • Night shifts are associated with the most pronounced negative lung function changes.
    • The observed variations suggest complex physiological adaptations or disruptions related to circadian rhythms in shift workers.