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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 [27]

From: Are changes in pain associated with changes in heart rate variability in patients treated for recurrent or persistent neck pain?

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

High frequency power (HF, 0.15–0.4 Hz)

Parasympathetic (vagal) activity

Frequency

Increase

Total power

Global HRV activity

Frequency

Increase