Table 1

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


Day 1
Day 2



Prone
Supine
(p)
Prone
Sitting
(p)

TP (ms2)
4896.39 ± 5579.34
4076.27 ± 4215.74
0.46 (w)
5004.72 ± 5797.60
2746.36 ± 2643.12
0.26 (w)
LF (ms2)
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 (ms2)
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)

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.

Watanabe et al. Chiropractic & Osteopathy 2007 15:19   doi:10.1186/1746-1340-15-19