Table 4 HRV parameters in different positions in the narrow frequency range (0,04–0,4 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 | |
|---|---|---|---|---|---|---|
TP (ms2) Median (IQR) | 498,5 (318–937,5) | 581,1 (171,4 – 1105,0) | 305,2 (212,0 – 473,0) | 253,3 (105,0 – 634,8) | p = 0,026 | S vs ST = 0,92 ST vs PT = 0,42 PT vs P = 0,29 S vs P = 0,06 S vs PT = 0,08 ST vs P = 0,09 |
HF – (ms2) Median (IQR) | 48,5 (28,8-104,3) | 51,0 (19,1 – 116,0) | 45,0 (22,0 – 69,4) | 46,0 (22,5–77, 8) | p = 0,081 | |
HF nu Median (IQR) | 17,35 (12,68 – 26,13) | 17,9 (13,8 – 24,4) | 20,7 (14,7 – 25,6) | 22,5 (16,1 – 36,1) | p = 0,053 | |
LF – (ms2) Median (IQR) | 256 (150–379,8) | 293,0 (85,7 – 293,0) | 142,0 (96,0 – 301,0) | 174,5 (54,8 – 295,8) | p = 0,015 | S vs ST = 0,46 ST vs PT = 0,047* PT vs P = 0,01* S vs P = 0,03* S vs PT = 0,15 ST vs P = 0,028* |
LF nu Median (IQR) | 82,7 (64, 6–87, 6) | 79,6 (65,1 – 86,2) | 78,3 (73,0 – 85,3) | 72,2 (55,9 – 83,0) | p = 0,174 | |
LF/HF§ Median (IQR) | 4,7 (2,3 – 7,1) | 4,3 (3,1 – 6,2) | 3,6 (2,8 – 5,8) | 2,72 (1,8 – 4,9) | p = 0,039 | S vs ST = 0,922 ST vs PT = 1,04 PT vs P = 0,29 S vs P = 0,144 S vs PT = 0,975 ST vs P = 0,162 |