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Ventilatory function changes over a workshift

H D Dimich, T D Sterling

    British Journal of Industrial Medicine
    |May 1, 1981
    PubMed
    Summary

    Chemical plant workers experienced reduced lung function (FVC, FEV, FEF 25-75) during 12-hour shifts, with no recovery by the end of the workweek. Evening shifts showed the most significant lung function decrements.

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    Area of Science:

    • Occupational Health
    • Pulmonary Medicine
    • Industrial Hygiene

    Background:

    • Workplace exposures in chemical plants can impact respiratory health.
    • Understanding acute changes in lung function during work shifts is crucial for worker safety.

    Purpose of the Study:

    • To investigate acute changes in lung function among chemical production workers over a 12-hour workshift.
    • To assess workshift and workweek effects on respiratory indices.

    Main Methods:

    • Pulmonary function tests were conducted on 34 production workers across three chemical plants.
    • Lung function indices including FVC, FEV1, and FEF 25-75 were measured.
    • Data were analyzed to identify decrements over shifts and across a workweek.

    Main Results:

    • A significant workshift decrement was observed in mean lung function indices (FVC, FEV1, FEF 25-75).
    • The evening shift exhibited the most pronounced lung function decline.
    • No recovery of mean %FEV1 and %FEF-25-75 was observed by the final working day, indicating a workweek effect.

    Conclusions:

    • Twelve-hour workshifts in chemical plants are associated with acute decrements in lung function.
    • The observed effects suggest potential cumulative impacts over a workweek, with limited recovery.
    • Diurnal variations in respiratory function partially explain, but do not fully account for, the workshift-related lung function changes.

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