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Short-term changes in upper extremity dynamic mechanical response parameters following power hand tool use.

M E Sesto1, R G Radwin, T G Richard

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

Ergonomics
|August 4, 2005
PubMed
Summary

Power tool use significantly reduces upper limb strength and alters mechanical properties like stiffness and effective mass, especially with longer torque build-up times. These changes correlate with increased discomfort.

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Area of Science:

  • Occupational Health
  • Biomechanics
  • Ergonomics

Background:

  • Power tool operation can impact upper limb physiological and mechanical properties.
  • Understanding these effects is crucial for preventing work-related musculoskeletal disorders.

Purpose of the Study:

  • To investigate the effects of power tool usage on upper limb mechanical response and physiological properties.
  • To determine how tool factors like peak torque and torque build-up time influence these effects.

Main Methods:

  • Twenty-nine inexperienced users operated a pistol grip nutrunner under controlled conditions (peak torque, build-up time).
  • Measurements included dynamic mechanical response (stiffness, damping, effective mass), physiological properties (strength, swelling), and upper limb symptoms.
  • A biomechanical model estimated handle force and displacement.

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Main Results:

  • Isometric strength decreased immediately post-use (15%) and at 24 hours (9%).
  • Mechanical stiffness and effective mass were significantly affected by torque build-up time (p < 0.05).
  • Longer build-up times (250 ms) resulted in greater decreases in stiffness (43%) and effective mass (57%) and increased discomfort.

Conclusions:

  • Power tool operation, particularly with longer torque build-up, negatively impacts upper limb mechanical properties and strength.
  • Higher predicted handle forces and displacements correlate with reduced stiffness, reduced effective mass, and increased discomfort.
  • Findings highlight the importance of tool design and usage parameters in mitigating occupational risks.