Increase of Short-Term Heart Rate Variability Induced by Blood Pressure Measurements during Ambulatory Blood Pressure Monitoring

Figure 1

Box-and-whiskers plots illustrating the behavior of HRV parameters related to blood pressure measurements. The red line represents the median value, the blue box shows the 25%–75% interquartile range (IQR), whiskers show +/− 1.5 × IQR distance from the edges of the boxes (in case of symmetrical distribution, this means median +/− 2 × IQR), and red points show the outliers.

(a) Daytime

(b) Nighttime

(c) 24 hours