Spectral parameters

Parameters	Normal weight		Overweight		Obese
Parameters	Supine	Tilt	Supine	Tilt	Supine	Tilt
RRi, ms	834 ± 122	640 ± 27 a	868 ± 97	716 ± 23^b	815 ± 78	735 ± 18^c
Spectral Parameters; RRi
Variance, ms²	1930 ± 489	1692 ± 363	1524 ± 323	887 ± 444	917 ± 389^ab	1241 ± 382
LF, ms²	895 ± 184	911 ± 294	311 ± 195^a	257 ± 84	69 ± 72^ab	203 ± 87^c
LF, nu	66 ± 12	87 ± 13^a	52 ± 11^a	73 ± 14^b	29 ± 18^ab	88 ± 5^c
HF, ms²	457 ± 132	146 ± 99^a	317 ± 94	94 ± 41^b	208 ± 135^a	46 ± 19^c
HF, nu	34 ± 12	13 ± 13^a	48 ± 11^a	27 ± 14^b	71 ± 18^ab	12 ± 5^c
LF/HF ratio	2.1 ± 0.39	6.9 ± 1.4^a	1.1 ± 0.51^a	4.3 ± 1.2^b	0.4 ± 0.36^ab	5.1 ± 1.1^c

Table 3: Spectral parameters calculated from R-R interval (RRi) time series obtained in supine position and during the tilt test in normal weight (NW), overweight (OW) and obese (OB) sedentary participants. All values were expressed as mean ± SD. ^aP<0.05 vs. NW supine; ^bP<0.05 vs. NW supine; and ^cP<0.05 vs. OW supine. “nu” indicates normalized units.