Assessment of the Relationship Between Rucksack Load and Standing Metabolic Rate
Technical Report,01 Jan 2020,01 Jan 2021
Biophysics and Biomedical Modeling Division, U.S. Army Research Institute of Environmental Medicine Natick United States
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There is a lack of quantitative data describing the impact that added load has on an individuals standing metabolic rate. Fourteen male US Army Soldiers age 21 plus or minus 2 years height 174 plus or minus 7 cm body mass 73 10 kg stood 6 minutes with four loads 0, 22, 44, and 66 percent body mass while wearing a respirator mask connected to a metabolic cart. Oxygen uptake was not significantly different between the 0 percent and 22 percent BM loads p 0.294 but was significantly higher with the 44 percent BM load versus both 0 percent BM and 22 percent BM p 0.05 loads. The 66 percent BM rucksack induced significantly greater oxygen uptake than the 0, 22, and 44 percent BM p 0.05. Light rucksack loads less than or equal to 22 percent body mass have a negligible effect on standing metabolic rate that may not be physiologically important. However, heavier rucksack loads greater than or equal to 44 percent body mass elicit more pronounced metabolic responses that cannot be overlooked.
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