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Related Experiment Videos

Trunk strength during asymmetric trunk motion.

W S Marras, G A Mirka

    Human Factors
    |December 1, 1989
    PubMed
    Summary
    This summary is machine-generated.

    Workplace trunk strength is crucial for preventing low back injury. Asymmetric angles significantly reduce trunk torque, while concentric and eccentric velocities have opposing effects on strength.

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    Area of Science:

    • Biomechanics
    • Occupational Health
    • Ergonomics

    Background:

    • Low back injury is a significant concern in manual materials handling.
    • Understanding trunk strength variations is vital for designing safer work environments.

    Purpose of the Study:

    • To investigate how trunk strength is affected by workplace factors.
    • To quantify the impact of trunk asymmetry and velocity on maximal trunk torque production.

    Main Methods:

    • Maximal trunk torque was measured in 44 subjects.
    • Trunk concentric and eccentric isokinetic velocities were varied.
    • Trunk asymmetric line of action was manipulated.

    Main Results:

    • Trunk torque decreased by ~8.5% for every 15° of asymmetric trunk angle.

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  • Increased concentric velocity reduced trunk strength; increased eccentric velocity enhanced strength.
  • Eccentric strength exceeded concentric strength only at forward trunk angles across all asymmetric angles.

    • Conclusions:

    • Trunk asymmetry and velocity are critical determinants of trunk strength.
    • Findings have implications for designing manual materials handling tasks to minimize injury risk.
    • Workplace environment modifications can be informed by these biomechanical insights.