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Energy Balance In Military Recruits Performing Intense Physical Efforts Under Extreme Climate Conditions.
HELLER INST OF MEDICAL RESEARCH TEL HASHOMER (ISRAEL)
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We assessed the energetic status of soldiers exposed to intense physical activities in cold and warm weather. Thirty subjects performing routine field maneuvers participated in a two phase study group A n18 in the winter phase and group n12 in the summer. Energy expenditure EE was measured by the doubly-labeled water DLW technique after a single, oral dosing of deuterium oxygen-15, daily urine sample were collected for 12 successive days. Energy intake El was assessed from detailed food records filled up at real-time and analyzed by computerize food charts. Energy balance EB was calculated as the difference between El and EE for each subject. Mean SE daily EE was 428117O and 3937159 kcalday for the winter and summer groups, respectively. Mean daily El was 2792124 kcalday in group A and similar in group B. A negative energy balance of 1422163 kcalday and 92423 kcalday N.S was calculated for group A and B, respectively. We concluded that the total energy expenditure is primarily determined by the level of activity rather than by environmental conditions. Energy intake, unaffected by climate conditions, is insufficient to offset the high energy requirements under these conditions, thus, leading to a negative energy balance in these troops.
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