Evaluation method for the metabolic and the autonomic nervous systems link response using indirect calorimetry and heart rate variability

Several evaluation methods exist to search the link between the metabolic system (MS) and the autonomic nervous system (ANS). Most of them are invasive and they are unable to follow fast adaptable mechanism of the MS and ANS response. In this work we explore a different non-invasive method using indirect calorimetry (IC) and heart rate variability (HRV). We used the clino-orthostatism maneuver as ANS oriented stimulus on 7 subjects to see the metabolic response and the set up sensitivity to the experiment. The results agree with the physiology knowledge and with our hypothesis on the stimulus-response paradigm. However, the population, the instrumentation and some physiological hypothesis used in this experiment are still under questioning.