Human Body Exergy Metabolism

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International Journal of Thermodynamics
Volume:16 Issue:2
Human Body Exergy Metabolism

Human Body Exergy Metabolism

Authors : Carlos MADY

Pages : 73-80

View : 14 | Download : 9

Publication Date : 2013-06-01

Article Type : Other Papers

Abstract :The exergy analysis of the human body is a tool that can provide indicators of health and life quality. To perform the exergy balance it is necessary to calculate the metabolism on an exergy basis, or metabolic exergy, although there is not yet consensus in its calculation procedure. Hence, the aim of this work is to provide a general method to evaluate this physical quantity for human body based on indirect calorimetry data. To calculate the metabolism on an exergy basis it is necessary to define the reference reactions and obtain their exergy variation. The reference reactions of the energy substrates are represented by the oxidation of the glucose, palmitic acid and a representative amino acid. Hence, from the exergy variation of these reactions and the consumption rate of the substrates, the metabolic exergy is determined. Results, for basal conditions and during physical activities, indicate that the difference between exergy and energy metabolisms is lower than 5%. Moreover, the body converts approximately 60% of the exergy of nutrients into available exergy to perform work.
Keywords : Exergy Analysis, Human Body, Metabolic Exergy

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