Skip to main content

Table 3 HRV parameters in different positions in the wide frequency range 0.04 Hz–1 Hz

From: The effect of sleeping position on heart rate variability in newborns

 supine
(S)
supine with tilt (ST)prone with tilt (PT)prone
(P)
p valueap valuebp valuec
TP (ms2) Median
(IQR)
596,5
(395,3-1021,5)
833,7
(251,9-1592,8)
406,0
(249,0-580,0)
327,0
(133,5-715,3)
p = 0,026S vs ST = 0,387
ST vs PT = 0,17
PT vs P = 0,24
S vs PT = 0,046*
S vs P = 0,048*
ST vs P = 0,036*
p = 0,018
HF – (ms2) Median
(IQR)
113,5
(60,0-214,8)
111,5
(50,0-238,5)
103,0
(47,0-173,0)
93,1
(58,0-237,0)
p = 0,250 p = 0,007
HF nu – Median (IQR)30,2 (23,3 – 45,8)33,8 (22,1 – 53,4)38,3 (23,5 – 51,3)49,1 (28,8 – 68,5)p = 0,06 p = 0,021
LF – (ms2) Median
(IQR)
256,0
(150,0-379,8)
298,5
(85,7-428,5)
147,0
(107,4-301,0)
185,5
(60,3-295,8)
p = 0,015S vs ST = 0,552
ST vs PT = 0,484
PT vs P = 0,106
S vs P = 0,019*
S vs PT = 0,261
ST vs P = 0,036*
p = 0,738
LF nu – Median
(IQR)
68,9 (52,9 – 77,8)66,9 (56,5 – 78,6)62,7 (53,0 – 77,9)50,7 (31,6 – 71,2)p = 0,034S vs ST = 0,795
ST vs PT = 0,75
PT vs P = 0,123
S vs P = 0,06
S vs PT = 0,987
ST vs P = 0,136
p = 0,576
LF/HF§ Median
(IQR)
2,4
(1,2-3,4)
1,97
(1,20-3,61)
1,61
(1,03-3,31)
1,04
(0,46-2,48)
p = 0,039S vs ST = 0,77
ST vs PT = 0,78
PT vs P = 0,12
S vs P = 0,24
S vs PT = 0,9
ST vs P = 0,15
 
  1. aFriedman test
  2. bWillcoxon signed rank test
  3. cRelated-Samples Friedman’s Two-Way Analysis of Variance by Ranks
  4. *p values < 0,05 (False discovery rate – FDR; corr. Factor Benjamini and Hochberg)
  5. IQR – interquartile range; HRV – heart rate variability, TP – total power; HF – high frequency power; LF – low frequency;§LF/HF - ratio of the LF and HF