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Maintenance operations: workstation adjustment, working posture, and workers' perceptions.

N J Delleman1

  • 1TNO Human Factors, Soesterberg, The Netherlands. delleman@tm.tno.nl.

International Journal of Occupational Safety and Ergonomics : JOSE
|April 25, 2000
PubMed
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This study on maintenance workers found that neck and shoulder posture significantly impact musculoskeletal load during tasks like wrenching and grinding. Guidelines were developed to optimize working heights and minimize physical strain.

Area of Science:

  • Occupational Health and Safety
  • Ergonomics
  • Biomechanics

Background:

  • Maintenance tasks involving pneumatic wrenching, oxy-gas cutting, and grinding often require awkward working postures.
  • Understanding the relationship between workstation adjustment and working posture is crucial for preventing musculoskeletal disorders (MSDs).
  • Existing guidelines for working heights may not fully account for the complex interplay of factors influencing posture adoption.

Purpose of the Study:

  • To investigate the determinants of working postures during visual-manual operations in maintenance tasks.
  • To formulate evidence-based guidelines for optimizing working heights to reduce musculoskeletal load.
  • To identify key factors influencing neck and shoulder biomechanics during industrial tasks.

Main Methods:

Related Experiment Videos

  • Experimental study involving maintenance workers performing tasks at five different heights.
  • Measurement of working postures and subjective worker perceptions.
  • Analysis of experimental data and existing literature on posture adoption mechanisms.

Main Results:

  • Working posture is constrained by a fixed relationship between gaze and head inclination.
  • Neck load is primarily determined by neck flexion/extension, not head inclination alone.
  • Shoulder and shoulder girdle load is significantly influenced by upper arm position relative to the trunk, particularly shoulder flexion/retroflexion.

Conclusions:

  • Neck flexion/extension and shoulder position are dominant factors in determining musculoskeletal load.
  • Guidelines for working height should consider these biomechanical relationships to minimize strain.
  • Optimizing workstation adjustments based on these findings can enhance worker health and safety.