Total body bioelectrical impedance is a method used to measure the body mass, liquid volume, and body fat, being recognized by the Brazilian Ministry of Health and the Food and a Food and Drug Administration as a valuable technique for this purpose. Indirect calorimetry is a non-invasive method to determine the nutritional needs and the utilization rate of energy substrates from oxygen consumption and carbon dioxide production obtained by analysis of the inhaled and exhaled air by the lungs