The dynamical fluctuations in the rhythms of biological systems provide valuable information about the underlying functioning of these systems. During the past few decades analysis of cardiac function based on the heart rate variability (HRV; variation in R wave to R wave intervals) has attracted great attention. resulting in more than 17000-publications (PubMed list). However. https://fitnessgravesyardes.shop/product-category/foot-rest-extrusion-deck/