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[Peripheral circulatory responses to sustained handgrip in workers using vibrating tools].

H Nakamura1, S Nohara, H Nakamura

  • 1Department of Public Health, School of Medicine, Kanazawa University.

Nihon Eiseigaku Zasshi. Japanese Journal of Hygiene
|June 1, 1990
PubMed
Summary

Workers using chain-saws experienced reduced finger blood flow and skin temperature during handgrip tests. Group C, with Raynaud

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Area of Science:

  • Occupational health
  • Peripheral circulation
  • Autonomic nervous system function

Context:

  • Chain-saw use involves prolonged static handgrip, potentially affecting peripheral circulation and autonomic function.
  • Workers are categorized by symptoms: asymptomatic (Group A), symptomatic without Raynaud's (Group B), and with Raynaud's phenomenon (Group C).

Purpose:

  • To investigate the effects of static handgrip force on peripheral circulatory and autonomic nervous functions in chain-saw workers.
  • To compare these effects across different symptom groups, including those with Raynaud's phenomenon.

Summary:

  • Handgrip tests at 30% maximum voluntary contraction (MVC) revealed significant decreases in finger blood flow (FBF) and finger skin temperature (FST) during exertion.
  • Group C (with Raynaud's) showed a less pronounced FBF decrease and a significantly smaller FBF increase post-exertion compared to Group A (asymptomatic).

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  • No significant differences were observed in FST response or blood pressure changes (systolic and diastolic) among the groups, suggesting localized circulatory rather than systemic autonomic dysfunction.

    • Impact:

    • Findings suggest that Raynaud's phenomenon may alter the peripheral circulatory response to static handgrip in chain-saw operators.
    • Highlights the need for targeted interventions for workers experiencing circulatory issues related to occupational hand-arm vibration and static forces.
    • Provides insights into the physiological mechanisms underlying hand-arm vibration syndrome (HAVS) and its relation to pre-existing vascular conditions.