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Related Experiment Videos

Physiological responses to prolonged treadmill walking with external loads.

J F Patton1, J Kaszuba, R P Mello

  • 1Occupational Physiology Division, US Army Research Institute of Environmental Medicine, Natick, MA 01760-5007.

European Journal of Applied Physiology and Occupational Physiology
|January 1, 1991
PubMed
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Energy cost during prolonged load carriage increases over time, even at low intensities. Current prediction models underestimate actual energy expenditure during extended load-bearing activities.

Area of Science:

  • Exercise Physiology
  • Human Performance
  • Biomechanics

Background:

  • Physiological responses to prolonged load carriage are not well-documented.
  • Understanding energy expenditure during load carriage is crucial for military and occupational settings.

Purpose of the Study:

  • To determine the energy cost of prolonged treadmill walking under various load conditions.
  • To assess the impact of load mass and walking speed on physiological responses.
  • To compare measured energy expenditure with predicted values.

Main Methods:

  • Fifteen male subjects completed nine randomized treadmill walking trials over 6 weeks.
  • Trials involved walking 12 km unloaded (5.2 kg) and with loads of 31.5 kg and 49.4 kg at speeds of 1.10, 1.35, and 1.60 m/s.

Related Experiment Videos

  • Oxygen uptake (VO2) was measured periodically, with rest intervals after 50 minutes of walking.

    • Main Results:

    • Oxygen uptake (VO2) remained stable unloaded but significantly increased over time with loads of 31.5 kg and 49.4 kg.
    • The 49.4 kg load resulted in higher VO2 than the 31.5 kg load across all speeds.
    • Prediction models underestimated actual metabolic cost by 10-16% in trials with significant VO2 increases.

    Conclusions:

    • Energy cost during prolonged load carriage is not constant and increases significantly over time.
    • This increase occurs even at exercise intensities below 30% VO2max.
    • Existing prediction models for energy expenditure may significantly underestimate costs for prolonged load carriage.