Parameters Normal weight Overweight Obese Sedentary Trained Sedentary Trained Sedentary Trained RRi, ms 834 ± 122 872 ± 88 868 ± 97 890 ± 81 815 ± 78 899 ± 66c Spectral Parameters, RRi Variance, ms2 1930 ± 489 1922 ± 436 1524 ± 323 1511 ± 434 917 ± 389ab 1521 ± 406 LF, ms2 895 ± 184 629 ± 205 311 ± 195a 301 ± 119 69 ± 72ab 219 ± 99c LF, nu 66 ± 12 63 ± 10 52 ± 11a 47 ± 14 29 ± 18ab 33 ± 9 HF, ms2 457 ± 132 364 ± 46 317 ± 94 441 ± 170 208 ± 135a 425 ± 141c HF, nu 34 ± 12 37 ± 10 48 ± 11a 53 ± 14 71 ± 18ab 67 ± 9 LF/HF ratio 2.1 ± 0.39 1.8 ± 0.33  1.1 ± 0.51a  0.8 ± 0.51 0.4 ± 0.36ab 0.5 ± 0.31

Table 2: Basal spectral parameters calculated from R-R interval (RRi) time series obtained in the supine position in normal weight (NW), overweight (OW) and obese (OB) participants. All values were expressed as mean ± SD. aP<0.05 vs. NW sedentary; bP<0.05 vs. NW trained; and cP<0.05 vs. OW sedentary. “nu” indicates normalized units.