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Related Experiment Videos

Physiological factors in stretcher carriage performance.

J J Knapik1, W Harper, H P Crowell

  • 1U.S. Army Center for Health Promotion and Preventive Medicine, Aberdeen Proving Ground, MD 21010, USA.

European Journal of Applied Physiology and Occupational Physiology
|April 20, 1999
PubMed
Summary

Muscle size and upper-body endurance are key for carrying casualties on stretchers. Forearm and thigh muscle areas, along with push-up performance, significantly predict stretcher carrying ability in soldiers.

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Area of Science:

  • Exercise Physiology
  • Human Performance
  • Military Medicine

Background:

  • Carrying casualties on stretchers is a critical military task.
  • Understanding the physiological determinants of stretcher carrying is essential for optimizing soldier performance and safety.

Purpose of the Study:

  • To identify anthropometric and physiological factors influencing the ability to perform a two-person manual stretcher carry.
  • To determine the predictive value of various physical attributes on stretcher carrying endurance.

Main Methods:

  • Eleven young soldiers underwent pretesting for anthropometry, body composition, physical fitness, and muscle cross-sectional areas.
  • Participants performed a two-person manual stretcher carry of an 82-kg manikin on a treadmill at 4.8 km/h until volitional fatigue.

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  • Stepwise multiple linear regression was used to analyze the relationship between physiological factors and carriage time.

    • Main Results:

    • Average stretcher carriage time was 2.7 minutes, with significant individual variability.
    • Forearm bone-plus-muscle cross-sectional area, thigh muscle cross-sectional area, and push-up performance were significant predictors of hand carriage time (r² = 0.99, P < 0.001).

    Conclusions:

    • Muscle cross-sectional area, particularly in the forearm and thigh, is a primary determinant of loaded stretcher carrying capacity.
    • Upper-body muscular endurance, as indicated by push-up performance, is also crucial for sustained stretcher carriage.
    • These findings highlight the importance of targeted strength and endurance training for soldiers involved in casualty evacuation.