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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 valuea

p valueb

p 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 = 0,026

S 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 = 0,015

S 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 = 0,034

S 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 = 0,039

S 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
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BMC Pediatrics

ISSN: 1471-2431

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