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Table 4 Comparison of heart rate variability measures between three groups; healthy normal subjects, white coat hypertension, and borderline hypertension subjects

From: Cognitive and autonomic dysfunction measures in normal controls, white coat and borderline hypertension

HRV 24-hours Normal BP (N = 20) WCH (N = 19) BLH (N = 30) Post-hoc
  Mean ± SD Mean ± SD Mean ± SD p value
24hr MHR 77 ± 8 71 ± 10 77 ± 8 > 0.05
24hr Triangular Index 43 ± 10 39 ± 16 37 ± 11 > 0.05
SDNN 154 ± 50 149 ± 46 130 ± 33 < 0.05
24hr SDNN Index 71 ± 28 64 ± 25 58 ± 15 > 0.05
SDANN 130 ± 47 130 ± 41 113 ± 32 > 0.05
RMSSD 45 ± 28 33 ± 22 31 ± 14 < 0.05
24IT ±SD 43 ± 10 39 ± 16 37 ± 11 > 0.05
  1. HRV; Heart rate variability, BP; blood pressure, WCH; White coat hypertension, BLH; borderline hypertension, MHR; Mean heart rate, SDNN; Standard deviation normal to normal interval, SDANN; Standard deviation average normal to normal interval, RMSSD; Square root of the mean squared differences of successive R-R intervals, 24IT; inspection time.