Journal of Applied Physiology
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J Appl Physiol 75: 1790-1797, 1993;
8750-7587/93 $5.00
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Journal of Applied Physiology, Vol 75, Issue 4 1790-1797, Copyright © 1993 by American Physiological Society

ARTICLES

Adequacy of food rations in soldiers during an arctic exercise measured by doubly labeled water

P. J. Jones, I. Jacobs, A. Morris and M. B. Ducharme
Division of Human Nutrition, University of British Columbia, Vancouver, Canada.

To investigate the adequacy of food rations to supply energy needs in cold-temperature environments, caloric expenditure and intake and body composition changes were measured in a group of infantrymen during a 10-day field exercise in the Canadian Arctic. Energy expenditure was measured by the doubly labeled water method (n = 10), and caloric intake was measured by complete food intake records (n = 20). Body composition was determined by isotope dilution (n = 10) and bioelectrical impedence analysis (n = 20) on days 0 and 10. Baseline isotopic enrichment shifts due to geographical relocation were also monitored (n = 5). Mean body weight decreased 0.63 +/- 0.83 (SD) kg over the study period (P < 0.005), although fat-free and fat mass compartment changes were not significant. Baseline isotopic changes were -4.65 +/- 2.54 and -0.48 +/- 0.07 /1000/day for deuterium and 18O, respectively. Mean baseline corrected energy expenditure level was 4,317 +/- 927 kcal/day. Self-reported caloric intakes obtained from food records were 2,633 +/- 499 kcal/day (61.0% of expenditure). Rations packs contained 4,350 kcal/day. Results suggest that 1) food intake was significantly underreported and 2) the energy needs of most subjects were being met by rations and available supplements.


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