A Simple Model Implementation to Measure Breath by Breath the VO2 and VCO2 by the Indirect Calorimetry Technique

This paper proposes a discrete random time series modeling for the VO₂ and VCO₂ measurement in the indirect calorimetry technique (ICT). Mathematical equations are developed in order to establish clear differences between the breath-by-breath and mixing chamber measurement based calorimeters. This simple model offers not only a physiological ICT definition approach but also defines the idea of VO₂ and VCO₂ short-term variability information for research. The preliminary results show a new physiological information when a computer oriented algorithm model implementation was applied to a data acquisition system in order to obtain the power spectrum analysis from a typical observation subject submitted to the clino-ortho maneuver