Abstract

Inter Beat intervals (IBI) in heart rate variability (HRV) are balanced by the actions of the sympathetic (SNS), parasympathetic neural systems (PSNS), and central cardiovascular plasticity. The neural systems are easy to reach by Photoplethymographic (PPG) means. PPG is also much used for fitness testing purposes. For the PPG pulse series analysis we used merged Poincaré plots parameters which have been much extended to evaluate pulse rate variability (PRV). The preliminary results demonstrated that the combination of merged Poincaré plots could show promise as a method for distinguishing between healthy individuals and different vascular disease groups. In addition, the hypothesis of this paper is that PPG pulse wave signals measured before and after the sauna exposure can lead to improve the understanding and estimation of the human body’s healthy status.