Operation Everest III: energy and water balance

K.R. Westerterp*, E.P. Meijer, M. Rubbens, P. Robach, J.P. Richalet

*Corresponding author for this work

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We hypothesized that hypoxia decreases energy intake and increases total energy requirement and, additionally, that decreased barometric pressure increases total water requirement. Energy and water balance was studied over 31 days in a hypobaric chamber at 452-253 Torr (corresponding to 4,500-8,848 m altitude), after 7 days acclimatization at 4,350 m. Subjects were eight men, age 27+/-4 years (mean+/-SD), body mass index 22.9+/-1.5 kg/m(2). Food and water intake was measured with weighed dietary records, energy expenditure and water loss with labelled water. Insensible water loss was calculated as total water loss minus urinary and faecal water loss. Energy intake at normoxia was 13.6+/-1.8 MJ/d. Energy intake decreased from 10.4+/-2.1 to 8.3+/-1.9 MJ/d (P
Original languageEnglish
Pages (from-to)483-488
Number of pages6
JournalPflugers Archiv-European Journal of Physiology
Issue number4
Publication statusPublished - 1 Jan 2000

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