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Related Experiment Videos

Psychophysically acceptable weights for a combination lifting task using bags with handles

T K Fredericks1, J E Fernandez, C C Rodrigues

  • 1Department of Industrial and Manufacturing Engineering, Wichita State University, KS 67260-0035, USA.

Journal of Human Ergology
|December 1, 1994
PubMed
Summary
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Using plastic bags for lifting groceries, especially over obstacles, significantly increases the maximum acceptable weight of lift (MAWOL). This suggests plastic bags enhance safety and reduce injury risk during manual handling tasks.

Area of Science:

  • Ergonomics
  • Occupational Health
  • Biomechanics

Background:

  • Manual handling tasks, such as loading groceries, pose risks for musculoskeletal injuries.
  • The psychophysical methodology is commonly used to assess safe lifting limits.
  • Factors like lifting height and frequency influence the maximum acceptable weight of lift (MAWOL).

Purpose of the Study:

  • To investigate the impact of sill height and lifting frequency on MAWOL during a simulated grocery loading task.
  • To compare the effects of plastic versus paper grocery bags on lifting capacity and safety.

Main Methods:

  • A simulated grocery bag loading task was performed by twelve male subjects.
  • Two sill heights (70 cm and 90 cm) and two frequencies (3 and 6 lifts/cycle) were tested.

Related Experiment Videos

  • A modified psychophysical method determined MAWOL, comparing plastic and paper bags.

    • Main Results:

    • Significant differences in MAWOL were found across different sill heights and lifting frequencies.
    • Plastic bags increased the average load lifted by 27% compared to paper bags.
    • This increase in load capacity with plastic bags enhances the safety factor.

    Conclusions:

    • Plastic bags, particularly those with handles, can decrease the risk of lower back injuries during manual handling.
    • Utilizing plastic bags may also reduce the risk of developing cumulative trauma disorders.
    • Optimizing manual handling techniques and bag types can improve occupational safety.