RESOURCES

About HRV

HRV describes the variations between consecutive inter-beat-intervals or IBIs. Both sympathetic and parasympathetic branches of the autonomic nervous system (ANS) are involved in the regulation of heart rate (HR).  Sympathetic nervous system (SNS) activity… Read more

HRV time series

For HRV analysis, inter-beat interval (IBI) data is required. Such data can be extracted from electrocardiogram (ECG) recording as time intervals between successive ECG R-waves, i.e. RR time intervals. Similarly IBI data can be extracted from photoplethysmography (PPG)… Read more

HRV preprocessing

Careful preprocessing of HRV data is very important before applying any HRV analysis methods. Any artefact in the RR interval time series may significantly interfere the analysis of these signals. The artefacts within HRV signals can be divided into… Read more

HRV analysis methods

In this section, the analysis methods available in Kubios HRV software are introduced. The presented methods are divided into four categories: 1) time-domain, 2) frequency-domain, 3) nonlinear, and 4) time-varying HRV analysis methods… Read more

HRV in assessing ANS function

HRV reflects variations between consecutive inter-beat-intervals. Both sympathetic and parasympathetic branches of the autonomic nervous system (ANS) are involved in the regulation of heart rate. Parasympathetic nervous system (PNS) activity is known to… Read more