## Heart Rate Variability (HRV) Analysis

Heart rate variability (HRV) is a reliable quantitative marker of autonomic nervous system activity, which can be assessed with time domain and frequency domain methods. The most popular time domain measures of HRV are the mean and standard deviation of RR-intervals and the RMSSD and pNN50 measures describing the short-term variability of heart rate. In the frequency domain analysis HRV is usually divided into three bands: VLF (0 -- 0.04 Hz), LF (0.04-- 0.15 Hz) and HF (0.15 -- 0.4 Hz). The powers of these bands and the ratio LF/HF are the most often used frequency domain measures.

#### Software Features

- Read-support for NeuroScan continuous CNT-files (NeuroSoft Inc.), Biopac AcqKnowledge-files (Biopac Systems Inc.), and POLAR heart rate monitors. The model S810 of POLAR monitors records the durations of each consecutive RR-interval and, therefore, a complete HRV analysis for its data is possible.
- Calculates the most common HRV time domain (mean/STD of RR-intervals, RMSSD, pNN50, etc.) and frequency domain (VLF, LF, and HF band powers and peak frequencies) measures. In the frequency domain analysis the power spectrum for the HRV is calculated with the traditional FFT based method and with a parametric method based on autoregressive time series modeling. The nonlinear Poincare plot analysis is included in the analysis as well.

#### HRV Analysis Program Interface

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