Analysis of heart rate variability based on quantitative approach

Heart rate variability (HRV) is the analysis of variations in the instantaneous heart rate in time series using beat-to-beat RR interval. HRV is considered as an indicator of the activity of autonomic regulation of circulatory function and as the one of the most significant methods of analyzing the activity of the autonomic nervous system (ANS). There are many methods that are used to detect heartbeats, such as ECG and blood pressure. Among them, ECG is considered as the best method to detect HRV signals since it provides a clear waveform, which makes it easier to exclude heartbeats not originating in the sinoatrial (SA) node.