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Table 3 Heart rate variability analyses in frequency domain (power spectral analyses) and three dimensional return map data of type 2 diabetic patients according to peripheral arterial disease

From: Cardiovascular autonomic neuropathy in type 2 diabetes mellitus patients with peripheral artery disease

  With PAD Without PAD P*
  n = 24 N = 43  
Power spectral analyses #
Very low frequency ms2/Hz 328 ± 295 755 ± 924 0.032
Low Frequency ms2/Hz 123 ± 152 490 ± 815 0.01
High Frequency ms2/Hz 61 ± 85 137 ± 162 0.005
Total Power ms2/Hz 538 ± 513 1406 ± 1880 0.031
Low frequency (LF) n.u. 0.55 ± 0.13 0.75 ± 0.42 0.56
High frequency (HF) n.u. 0.31 ± 0.06 0.25 ± 0.14 0.46
Low frequency/ High frequency 1.98 ± 0.9 3.37 ± 1.82 0.067
Three dimensional return map
P1 24-h 59.5 ± 9.5 61.6 ± 8.7 0.38
P1 day 58.0 ± 9.5 61.0 ± 7.7 0.17
P1 night 61.7 ± 9.4 66.8 ± 9.7 0.04
P2 24-h 54.5 ± 15.2 62.7± 2.9 0.02
P2 day 46.5 ± 13.6 54.9 ± 12.7 0.01
P2 night 44.5 ± 14.5 51.9 ± 12.7 0.03
P3 24-h 75.0 ± 37.1 80.3 ± 30.8 0.52
P3 day 65.4 ± 33.7 72.5 ± 30.3 0.37
P3 night 61.4 ± 24 65.6 ± 23 0.47
MN 24-h 272 ± 227 326 ± 195 0.31
MN Day 195 ± 156 259 ± 182 0.15
MN night 186 ± 136 247 ± 135 0.08
  1. Data expressed as mean ± SD; P1 = index reflecting sympathetic modulation; P1, P2, and P3 are expressed as arbitrary units; P2 and P3 = indices reflecting vagal modulation; MN = global modulation; * Student t-test; # Data were log transformed before analyses.