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Table 2 Mean and standard-deviation for time-domain indices between before and after the orthostatic test

From: Fractal correlation property of heart rate variability in response to the postural change maneuver in healthy women

Index Control 0-5 min 5-10 min 10-15 min p
SDNN (ms) 45.4 ± 6 43.5 ± 15 38.2 ± 9 *34.1 ± 4 0.045
RMSSD (ms) 30.1 ± 11 18.5 ± 7 16.4 ± 9 *15.2 ± 4 0.0176
pNN50 (%) 12.3 ± 15 3.7 ± 3 2.9 ± 3 *2 ± 1 0.012
  1. SDNN: standard deviation of normal-to-normal R-R intervals; pNN50: the percentage of adjacent RR intervals with a difference of duration greater than 50 ms; RMSSD: root-mean square of differences between adjacent normal RR intervals in a time interval. ms: millisecond. *p < 0.05: Vs. Control.