Load Carriage Model Development and Testing with Field Data
ARMY RESEARCH INST OF ENVIRONMENTAL MEDICINE NATICK MA
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The results of a field study of the energy cost of downhill walking and load carriage were used to test a modification of the Pandolf equation PE for the prediction of downhill load carriage energy costs. PE is a predictive equation for the energy cost of walking and load carriage on level and uphill terrain. The field study objective was to broaden the database to include slower walking speeds. A new dataset was collected in the field with loads of 0 kg and 27.2 kg at speeds of 0.89 mxs and 1.12 mxs- on grades of 0, -4, -8.6 and -10.2. Oxygen uptake was collected using portable oxygen monitors. To adjust the PE for downhill movement, a correction factor CF was derived using data from a prior laboratory study. The final equation is CF hxGxWLxV3.5 - WLxG62W 25-v2. The adjusted values, using the M PE - CF format, fit well for walking at 1.12 mdots, but at 0.89 mdots, values were underestimated. Thus, an adjusted PE derived from a laboratory study for walking, and load carriage was valid at 1.12 mdots for loads up to 27 kg, but was not acceptable at 0.89 mdots.
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