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Vibration-induced decrease in the muscle force in lumberjacks

M Färkkilä, I Pyykkö, O Korhonen

    European Journal of Applied Physiology and Occupational Physiology
    |February 1, 1980
    PubMed
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    Occupational vibration exposure significantly reduced hand grip force in lumberjacks, suggesting peripheral nerve issues. Fatigue mechanisms in lumberjacks and controls were similar, despite reduced force in exposed lumberjacks.

    Area of Science:

    • Occupational health
    • Ergonomics
    • Neurology

    Background:

    • Hand grip force is crucial for manual labor.
    • Occupational vibration exposure is common in industries like logging.
    • Understanding the impact of vibration on grip strength and fatigue is essential for worker safety.

    Purpose of the Study:

    • To investigate the effects of vibration exposure on isometric maximal hand grip force in lumberjacks.
    • To compare grip force and fatigue patterns between lumberjacks and control subjects.
    • To explore potential mechanisms behind grip force reduction during vibration.

    Main Methods:

    • Isometric maximal hand grip force measured using a strain gauge dynamometer.
    • 91 lumberjacks and 31 control subjects participated.

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  • Tests conducted with and without simultaneous vibration exposure over a 2-min task.

    • Main Results:

    • Older subjects exhibited lower muscle forces than younger subjects, irrespective of vibration.
    • Lumberjacks showed a significant decrease in left-hand grip force during vibration, unlike controls.
    • Lumberjacks with pre-existing diminished grip force experienced greater reductions during vibration.

    Conclusions:

    • Vibration exposure appears to impair hand grip force in lumberjacks, potentially due to peripheral nerve damage and tonic vibration reflex activation.
    • Fatigue mechanisms are comparable between lumberjacks and controls.
    • Circulatory disturbances are unlikely to be the primary cause of force reduction.