Journal of Applied Physiology Millar Instruments
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J Appl Physiol 81: 201-207, 1996;
8750-7587/96 $5.00
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Journal of Applied Physiology, Vol 81, Issue 1 201-207, Copyright © 1996 by American Physiological Society

ARTICLES

Energy expenditure in rhesus monkeys (Macaca mulatta) during spaceflight using doubly labeled water (2H2(18)O)

T. P. Stein, M. A. Dotsenko, V. I. Korolkov, D. W. Griffin and C. A. Fuller
Section of Neurobiology, Physiology, and Behavior, University of California, Davis 95616-8519, USA.

The mean daily energy expenditure rates of three rhesus monkeys (Macaca mulatta) were determined during spaceflight on the joint US-Russian Cosmos 2044 and 2229 missions by the doubly labeled water (2H2(18)O) method. In-flight values were compared with ground data obtained from seven measurements taken from six chair-adapted control monkeys. The mean energy expenditure for the ground control determinations was 94.5 +/- 6.4 kcal.kg-1.day-1 (n = 6). The mean in-flight energy expenditure, 55.1 +/- 8.0 kcal.kg-1.day-1 (n = 3), was significantly less than the mean ground control value (P < 0.05). These data suggest that energy expenditure in restrained rhesus monkeys is significantly reduced during spaceflight.


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