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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.