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Real-time visual feedback can cue changes in grip force during electric hand tool operation.

Brendan L Pinto1, Daniel Loewen2, Naveen Chandrashekar2

  • 1Department of Kinesiology and Health Sciences, University of Waterloo, Canada.

International Journal of Occupational Safety and Ergonomics : JOSE
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Real-time visual feedback effectively reduced excessive grip force and muscle activity during electric hand tool use. This approach shows promise for preventing work-related musculoskeletal disorders in repetitive tasks.

Keywords:
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Area of Science:

  • Occupational Health
  • Ergonomics
  • Human Factors Engineering

Background:

  • Repetitive hand tool use can lead to excessive grip force, increasing the risk of cumulative trauma disorders.
  • Augmented feedback interventions are understudied for modifying grip force during electric hand tool operation.

Purpose of the Study:

  • To assess the feasibility of real-time visual feedback for modifying grip force and forearm electromyography (EMG) during electric hand tool use.
  • To investigate the influence of hand and tool orientation on the effectiveness of visual feedback.

Main Methods:

  • Participants used an electric pistol-grip nut-runner to fasten bolts at various locations (low, high, overhead).
  • Grip force and forearm muscle EMG were measured with and without real-time visual feedback.
  • Data were analyzed to determine the effects of feedback and tool orientation.

Main Results:

  • Visual feedback significantly decreased grip force by 36.1% and forearm EMG by 22.8-33.0%.
  • Grip force and EMG varied by fastening location.
  • Feedback effectiveness was consistent across different hand and tool orientations, with no significant interactions.

Conclusions:

  • Real-time visual feedback is a viable method for reducing grip force during electric hand tool operation.
  • Further research is required to optimize the implementation of visual feedback strategies for occupational settings.