Table 1 Heart Rate Variability indices suggested by The Taskforce of the European Society of Cardiology and the North American Society of Pacing and Electrophysiology
HRV indices | Indicator of | Domain measure | Change that improves HRV |
|---|---|---|---|
R-R interval | Global HRV activity | Time | Increase |
Root mean squared successive differences between IBIs (RMSSD) | Parasympathetic (vagal) activity | Time | Increase |
The standard deviation of IBIs (SDNN) | Global HRV | Time | Increase |
Low frequency power (LF, 0.04–0.15 Hz) | Baroreceptor-sympathetic and parasympathetic cardiac activity | Frequency | Increase |
High frequency power (HF, 0.15–0.4 Hz) | Parasympathetic (vagal) activity | Frequency | Increase |
LF/HF ratio | Sympathetic-to-parasympathetic balance | Frequency | Decrease |
Total power | Global HRV activity | Frequency | Increase |