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Am J Physiol Regul Integr Comp Physiol 244: R764-R769, 1983;
0363-6119/83 $5.00
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AJP - Regulatory, Integrative and Comparative Physiology, Vol 244, Issue 6 764-R769, Copyright © 1983 by American Physiological Society

ARTICLES

Energy metabolism rate equation for fasting and postabsorptive subjects

M. Ben-Porat, S. Sideman and S. Bursztein

The energy metabolism rate, an important parameter in severe clinical polytrauma and burns, is evaluated here using mass conservation law and simple thermodynamic considerations. The expressions for the energy and fat metabolism rates are evaluated utilizing easily measurable quantities: oxygen consumption, CO2 production, and nitrogen excretion rates. The derived equations are identical for the fasting and postabsorptive states, independent of feed composition. A new criteria for distinguishing between the fasting and postabsorptive states is suggested. These equations should help in evaluating energy metabolism rate for patients receiving continuous parenteral nutrition.




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