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Upper limb dynamic responses to impulsive forces for selected assembly workers.

Mary E Sesto1, Robert G Radwin, Walter F Block

  • 1Department of Industrial Engineering, University of Wisconsin, Madison, Wisconsin 53706-1608, USA.

Journal of Occupational and Environmental Hygiene
|December 20, 2005
PubMed
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Symptomatic assembly workers using power tools exhibited significantly reduced upper limb mechanical stiffness, damping, and effective mass. These findings suggest an impaired ability to counteract tool-induced forces, highlighting potential ergonomic risks.

Area of Science:

  • Biomechanics
  • Occupational Health
  • Ergonomics

Background:

  • Power tool use in assembly work can lead to upper limb musculoskeletal issues.
  • Understanding the dynamic mechanical responses of the upper limb is crucial for assessing occupational risks.

Purpose of the Study:

  • To evaluate upper limb dynamic mechanical response parameters in male assembly workers.
  • To determine if power tool type and worker symptoms influence mechanical properties like stiffness, effective mass, and damping.

Main Methods:

  • Characterized upper limb mechanical parameters (stiffness, effective mass, damping) using an oscillating handle apparatus in free vibration.
  • Categorized 14 male assembly workers into cases (symptomatic) and controls (asymptomatic) based on surveys and physical exams.

Related Experiment Videos

  • Utilized magnetic resonance imaging (MRI) to assess for muscle edema.

    • Main Results:

    • Symptomatic workers (cases) showed significantly reduced average mechanical stiffness (46%), damping (74%), and effective mass (59%) compared to asymptomatic workers (controls).
    • Two cases using torque reaction tools displayed MRI findings suggestive of muscle edema.
    • No MRI enhancement was observed in subjects not regularly using torque reaction tools.

    Conclusions:

    • Symptomatic workers demonstrated altered upper limb biomechanics, characterized by decreased stiffness, damping, and effective mass.
    • These mechanical changes may reduce the capacity of symptomatic workers to manage torque reaction forces from power tools.
    • Findings underscore the ergonomic implications of reduced upper limb mechanical function in power tool operators.