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Table 1 Comparison of heart rate variability parameters on Day 1 and Day 2; N = 15.

From: Effects of body position on autonomic regulation of cardiovascular function in young, healthy adults

 

Day 1

Day 2

 

Prone

Supine

(p)

Prone

Sitting

(p)

TP (ms 2 )

4896.39 ± 5579.34

4076.27 ± 4215.74

0.46 (w)

5004.72 ± 5797.60

2746.36 ± 2643.12

0.26 (w)

LF (ms 2 )

1023.57 ± 1505.68

963.55 ± 1095.13

0.13 (w)

800.09 ± 791.30

667.95 ± 731.74

0.61 (w)

LF (nu)

40.70 ± 21.12

40.93 ± 19.85

0.97 (t)

37.61 ± 18.46

59.87 ± 20.88

0.001 (t)

HF (ms 2 )

2069.20 ± 3292.70

1975.40 ± 3304.52

0.26 (w)

2145.69 ± 3320.78

577.78 ± 650.45

0.001 (w)

HF (nu)

55.91 ± 21.22

56.61 ± 19.67

0.90 (t)

58.42 ± 18.12

35.84 ± 20.87

< 0.001 (t)

LF/HF

0.98 ± 0.76

0.93 ± 0.69

0.81 (t)

0.82 ± 0.65

3.00 ± 3.07

0.001 (w)

  1. Expressed as mean ± SD; (t) = paired t-test, (w) = Wilcoxon signed-rank test, HF = high frequency of HRV power spectrum, LF = low frequency, LF/HF = ratio of low frequency to high, TP = total power, ms2 = milliseconds squared, nu = normalised unit.