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Method and performance: two elements of work technique

K Kjellberg1, L Lindbeck, M Hagberg

  • 1Department for Work and Health, National Institute for Working Life, Solna, Sweden.

Ergonomics
|June 18, 1998
PubMed
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Work technique involves method and performance. Kinematic, kinetic, electromyographic, and psychophysical variables differentiate these elements, highlighting the need for individualized assessment in biomechanics and ergonomics.

Area of Science:

  • Biomechanics
  • Ergonomics
  • Occupational Health

Background:

  • Work technique is crucial for task efficiency and injury prevention.
  • Understanding the distinct components of work technique (method vs. performance) is essential for effective analysis.

Purpose of the Study:

  • To investigate how kinematic, kinetic, electromyographic, and psychophysical variables characterize work task methods and individual performances.
  • To determine if specific variables can differentiate between lift methods (back vs. leg) and lift speeds (fast vs. slow).

Main Methods:

  • Twelve female subjects performed box lifts using back and leg methods, with fast and slow simulated performances.
  • Measurements included motion analysis, ground reaction forces, lower back muscle activity (electromyography), and perceived exertion.

Related Experiment Videos

  • A dynamic biomechanical model was employed for data analysis.

    • Main Results:

    • Trunk angular displacement and velocity effectively distinguished between back and leg lift methods.
    • Trunk angular velocities, accelerations, L5/S1 moments, and electromyography (EMG) variables correlated with task performances.
    • Inter-individual variability in work technique was greater than intra-individual variability across repetitions.
    • EMG patterns revealed muscle activation differences not captured by kinematic or kinetic data.

    Conclusions:

    • Separate variables are recommended for describing work methods (e.g., range of motion) and task performances (e.g., displacement time derivatives, load variables).
    • Inter-individual differences in work technique necessitate an individualized approach to evaluation.
    • EMG analysis provides unique insights into muscle activation patterns during lifting tasks.