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Related Experiment Videos

Back muscle strength, lifting, and stooped working postures.

E Poulsen1, K Jørgensen

  • 1The Department of Physiology, The Danish National Association for Infantile Paralysis, Hellerup, Denmark.

Applied Ergonomics
|September 1, 1971
PubMed
Summary

This study developed formulas to predict safe lifting loads based on back muscle strength. These findings help prevent back injuries during manual handling tasks.

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Area of Science:

  • Occupational Health
  • Biomechanics
  • Ergonomics

Background:

  • Manual handling tasks, particularly lifting and working in stooped positions, place significant stress on the spine.
  • Understanding the role of back muscles versus passive spinal structures in managing gravitational forces is crucial for injury prevention.

Purpose of the Study:

  • To develop predictive formulas for maximal lifting loads based on back muscle strength.
  • To establish criteria for sustaining work in a stooped position without undue fatigue or pain.
  • To provide standard values for permissible lifting in occupational settings.

Main Methods:

  • Isometric back muscle strength measurements were taken from male and female subjects.
  • Predictive formulas for maximum load were derived from these strength measurements.
  • Strength requirements for avoiding fatigue/pain in stooped work were assessed in a cohort of rehabilitees.

Main Results:

  • Predictive formulas for maximum load were established: max. load = 1.10 x isometric back muscle strength (men) and max. load = 0.95 x isometric back muscle strength - 8 kg (women).
  • Standard values for maximum, single, and repeated lifts were calculated separately for men and women.
  • Back muscle strength exceeding 2/3 of body weight is recommended for stooped work to prevent pain and fatigue.

Conclusions:

  • Isometric back muscle strength is a reliable predictor of safe lifting capacity.
  • The derived formulas and standard values can guide workplace interventions to reduce the risk of back injuries.
  • Maintaining adequate back muscle strength is essential for preventing musculoskeletal disorders during stooped occupational tasks.

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