Physiological and Perceptual Responses to Prolonged Treadmill Load Carriage
Final rept. May 1988-Nov 1989
ARMY RESEARCH INST OF ENVIRONMENTAL MEDICINE NATICK MA
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The objectives of this study were to 1 determine the physiological and perceptual responses to prolonged, level treadmill walking fixed distance of 12 km at speeds of 3.96, 4.86, and 5.76 kmhr, unloaded clothing wt of 5.2 kg and with external loads load carriage equipment backpack of 31.5 and 49. 4 kg, 2 determine the ability of subjects to perform high intensity, anaerobic exercise Wingate test immediately after load carriage, and 3 compare the energy cost and perceptual responses of carrying the standard external frame pack to that of the new internal system. Fifteen male subjects performed nine load carriage trials with an external frame pack ALICE and two trials with an internal frame pack IIFS in random order over a 7 week period. The results show that 1 energy cost during prolonged load-carriage is not constant but increases significantly over time at relative intensities below 30 VO2max, 2 the load-carriage conditions of this study were not sufficient to cause fatigue as assessed by blood lactate levels and maximal power outputs, and 3 the two load-carriage systems studied did not differ as to their effects on physiological an perceptual responses to prolonged treadmill walking.
- Stress Physiology