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Related Experiment Videos

Work pace, stress, and cumulative trauma disorders.

R Arndt1

  • 1Department of Preventive Medicine, University of Wisconsin, Madison.

The Journal of Hand Surgery
|September 1, 1987
PubMed
Summary

Faster work paces increase muscle force, contributing to cumulative trauma disorders. However, attempts to change pace, not just speed, significantly alter muscular activity, highlighting work pressure as a key factor.

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Area of Science:

  • Occupational Health
  • Ergonomics
  • Biomechanics

Background:

  • Cumulative trauma disorders (CTDs) are a significant concern in repetitive occupational tasks.
  • High incidence of CTDs has been previously identified in specific repetitive tasks.

Purpose of the Study:

  • To investigate the role of work pace and work pressure as risk factors for CTDs.
  • To analyze the relationship between work pace, muscular activity, and force generation.

Main Methods:

  • Electromyographic (EMG) data were collected from forearm flexor muscles during a repetitive task.
  • Workers modulated their work pace (speed up/slow down) under controlled conditions.
  • EMG activity was correlated with changes in work pace and task demands.

Main Results:

  • Increased work pace correlated with higher muscle force (EMG activity).
  • Unsuccessful pace adjustments (speeding up or slowing down) also increased EMG activity.
  • This suggests factors beyond mere movement speed contribute to muscular strain.

Conclusions:

  • Both work pace and work pressure are significant risk factors for CTDs.
  • Muscular activity is influenced by more than just task speed, including the stress of pace control.
  • Ergonomic interventions should consider both physical demands and psychological pressures.

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