Table 1: Interpretation of HRV parameters.

HRV parameterInterpretation

Total power of the HRV spectrum (TP)Total strength of ANS (overall state of HRV)
Very low frequency component (VLF)Sympathetic regulation
Low frequency component (LF)Both sympathetic and parasympathetic activities
High frequency component (HF)Parasympathetic activity and the frequency of respiration
Ratio of absolute LF to HF power (LF/HF)Sympathetic-parasympathetic balance