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Table 1 Frequency domain of HRV in subjects with primary hypertension and in the control group.

From: Cardiac autonomic control in adolescents with primary hypertension

  Primary Hypertension Control P
  Awake state  
LF 38.12 ± 1.05 33.79 ± 1.42 0.031
HF 34.63 ± 1.26 37.71 ± 1.12 0.018
LF/HF 1.28 ± 0.05 0.91 ± 0.04 0.002
  Sleep  
LF 35.52 ± 1.17 32.69 ± 0.90 NS
HF 48.17 ± 1.98 54.57 ± 0.75 0.004
LF/HF 0.78 ± 0.06 0.60 ± 0.02 0.014
  1. Values are means ± SE; LF - spectral power in low frequency band and HF - spectral power in high frequency band in normalized units (NU).