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[Studies on physiological changes due to prolonged standing posture (author's transl)]

M Sugawara

    [Hokkaido Igaku Zasshi] the Hokkaido Journal of Medical Science
    |May 1, 1981
    PubMed
    Summary

    Prolonged standing posture alters body weight fluctuations and muscle activity. The body utilizes visual feedback for balance, indicating standing itself isn't a major stressor.

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    Area of Science:

    • Human Physiology
    • Biomechanics
    • Neuroscience

    Context:

    • Understanding the physiological effects of prolonged static work is crucial for occupational health.
    • Maintaining a standing posture for extended periods can impact neuromuscular control and body sway.

    Purpose:

    • To investigate the influence of prolonged standing on human body sway, muscle activity, and brain waves.
    • To differentiate physiological responses to static work based on body weight fluctuation patterns.

    Summary:

    • Prolonged standing resulted in two types of body weight fluctuations (Type A and B) with distinct spectral characteristics.
    • Type B fluctuations correlated with increased gastrocnemius muscle activity at around 10 Hz and a shift in weight distribution to the heel.
    • Brain alpha waves increased over time, suggesting a role for visual feedback in maintaining balance, independent of concentration levels.

    Impact:

    • Findings suggest a dual regulatory mechanism for balance during standing, involving both reflex loops and visual input.
    • Prolonged standing may not be inherently stressful, but monotonous work requires further analysis of physiological and psychological loads.
    • This research provides insights into human adaptation to static postures and informs strategies for mitigating occupational fatigue.

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