Human Body Exergy Metabolism

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1. Glucose Palmitic Ac. Amino Ac. Hayne (2008) ‒16506 ‒39141 ‒18964 Cortassa (2002) ‒16516 ‒39223 ‒17578 Finally, the metabolisms on energy and exergy basis using the data from Hayne (2008) and from Cortassa et al. (2002) are 2 2 11371 2366 6891 Hayne O CO N M m m m    (18), 2 2 9501 3963 6979 M Hayne O CO N B m m m    (19) 2 2 11179 2502 1580 Cortassa O CO N M m m m    (20), 2 2 9558 3928 1823 M Cortassa O CO N B m m m    (21) 2 Energy and exergy metabolism 1 Basal conditions Results in Table 5 indicate the metabolism on energy and exergy basis, considering the oxidation of proteins (M and B M ) and disregarding the oxidation of proteins (M p and B Mp ) for the energy measurements obtained by Hardy & Du Bois (1938). For this condition, the authors obtained that the metabolism is 79.8W. In all cases the difference between this value and the ones calculated herein was not larger than 2%. Furthermore, the difference of the metabolism using the two different references of thermodynamic properties did not differ more than 2%. The ratio of metabolism on energy and exergy basis (considering and disregarding the oxidation of proteins) did not exceed 1.02. Hence, as in Batato et al. (1990), the approximation B M ≈ M for basal conditions is valid. Table 5. Metabolism in energy and exergy basis with the oxidation of amino acids (M and B M ) and without the oxidation of amino acids (M p and B Mp ). Hayne (2008) (W) Cortassa et al. (2002) (W) M 3 9 M p 3 1 B M 8 7 B Mp 9 0 2 Physical activities For the experimental results of Figure 2 the metabolism in energy and exergy basis was calculated, using the values of thermodynamic properties of Cortassa et al. (2002) indicated in Eqs. (20) and (21), due to the small difference between results in Table 5. Figure 3 indicates M, B M and B QM for the experimental data of Figure 2. The difference of B M and B QM is one order of magnitude, indicating that when the metabolism is calculated as B QM (taking into account only the thermal exergy), more than 95% of the exergy content of metabolism is disregarded. Therefore, most of the available exergy to perform work would be disregarded. In Figure 4 it is demonstrated the ratio of the metabolism on energy and exergy basis as a function of time. In the first five minutes, the ratio B M /M ranged from 04 to 1.01 (time when the subject controlled the Figure 5. Ratio of the metabolism considering and disregarding the oxidation of proteins during the treadmill test. Figure 6 Re