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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

From: The effect of spinal manipulative therapy and home stretching exercises on heart rate variability in patients with persistent or recurrent neck pain: a randomized controlled trial

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
  1. All indices are expected to increase with improved HRV except for the LF/HF ratio