Table 2.

Measures of HRV Parameters in Patients Classified with Left Ventricular Ejection Fraction (EF)

	EF ≥ 50% (n = 22)	EF < 50% (n = 27)
Gender (Male/Female)			16/6	18/9
Age	66.8 ± 11.5	60.7 ± 13.1
Time‐domain measures
HR (bpm)	67.6 ± 7.73	75.8 ± 16.9
SDNN (ms)	121 ± 36.9	106 ± 49.8
rMSSD (ms)	27.8 ± 14.8	27.4 ± 18.3
%NN50 (%)	6.36 ± 8.13	7.85 ± 11.5
Geometric measures
TINN (ms)	541 ± 174	412 ± 174 a
TI	66.1 ± 22.1	48.7 ± 21.5 a
90% length (ms)	553 ± 164	486 ± 223
90% width (ms)	62.5 ± 43.8	61.0 ± 46.5
Length/width	10.7 ± 3.98	10.9 ± 6.44
Frequency‐domain
measures
lnULF (ms2)	8.11 ± 0.56	7.63 ± 0.99
lnVLF (ms2)	7.16 ± 0.72	6.69 ± 1.20
lnLF (ms2)	5.54 ± 1.01	4.81 ± 1.34
lnHF (ms2)	4.63 ± 1.13	4.09 ± 1.40
LF/HF	2.75 ± 1.43	2.43 ± 1.52
α	−1.24 ± 0.21	−1.24 ± 0.24

Abbreviations same as Table 1. ^aP < 0.05.