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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.
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