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Physical load on the cardiovascular system in different work tasks.

J Ilmarinen

    Scandinavian Journal of Work, Environment & Health
    |December 1, 1984
    PubMed
    Summary

    This review examines cardiovascular load during dynamic work, linking oxygen consumption (VO2) and heart rate (HR) to work intensity. It highlights how certain job types, like producing muscle forces, elevate heart rate significantly, especially with age.

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    Area of Science:

    • Occupational Health
    • Cardiovascular Physiology
    • Workload Assessment

    Background:

    • Dynamic work involves physiological stress and strain, impacting the cardiovascular system.
    • Understanding the relationship between workload, oxygen consumption (VO2), and heart rate (HR) is crucial for assessing occupational cardiovascular load.
    • Intervening variables can influence the physiological responses to work.

    Purpose of the Study:

    • To review and describe the cardiovascular load experienced during dynamic work.
    • To analyze the relationship between relative aerobic strain (RAS), HR, and different types of muscular work.
    • To identify work tasks that impose a cardiovascular load above acceptable levels.

    Main Methods:

    • Review of existing literature on cardiovascular load in dynamic work.
    • Analysis of the relationship between oxygen consumption (VO2), heart rate (HR), and workload.
    • Examination of relative aerobic strain (RAS) in relation to HR and muscular work type.

    Main Results:

    • Heart rate (HR) response to work is dependent on the type and combination of muscular work.
    • Significant differences in cumulative HR curves were observed between job profiles (e.g., 'producing muscle forces' vs. others).
    • Certain occupations (milk delivery, mail delivery, logging, construction, steel industry, municipal sector) were analyzed for their cardiovascular demands, with some exceeding acceptable levels.

    Conclusions:

    • Work tasks involving significant muscle force production or motor function coordination lead to higher and prolonged elevated heart rates.
    • Cardiovascular strain increases with age in tasks requiring muscle force production and motor coordination.
    • Identifying and mitigating high cardiovascular loads in specific occupations is essential for worker health.

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