Table 2.

Determinants of standard time- and frequency-domain (calculated with FFT) HRV parameters.

Standard HRV parameter	Determinant	Parameters of multiple regression analysis
		β	p	Partial correlation	Multiple R2	F-test	p
SDNN (ln)	HR	-0.73	<0.001	-0.70	0.50	102.3	<0.001
	Age (ln)	-0.23	<0.001	-0.30
	Sex	0.03	0.54	0.04
RMSSD (ln)	HR	-0.81	<0.001	-0.77	0.60	153.8	<0.001
	Age (ln)	-0.24	<0.001	-0.35
	Sex	0.01	0.74	0.02
pNN50 (ln)	HR	-0.77	<0.001	-0.72	0.53	113.0	<0.001
	Age (ln)	-0.23	<0.001	-0.30
	Sex	-0.02	0.59	-0.03
VLF (ln)	HR	-0.49	<0.001	-0.47	0.24	31.9	<0.001
	Age (ln)	-0.19	<0.001	-0.21
	Sex	0.05	0.30	0.06
LF (ln)	HR	-0.61	<0.001	-0.58	0.36	57.3	<0.001
	Age (ln)	-0.20	<0.001	-0.23
	Sex	0.08	0.09	0.10
HF (ln)	HR	-0.70	<0.001	-0.67	0.46	85.9	<0.001
	Age (ln)	-0.26	<0.001	-0.32
	Sex	<0.01	0.88	<0.01
TP1 (VLF+LF+HF) (ln)	HR	-0.69	<0.001	-0.67	0.45	85.4	<0.001
	Age (ln)	-0.24	<0.001	-0.30
	Sex	0.03	0.43	0.05
TP2 (LF+HF) (ln)	HR	-0.70	<0.001	-0.67	0.46	86.1	<0.001
	Age (ln)	-0.24	<0.001	-0.30
	Sex	0.03	0.46	0.04
LF/HF (ln)	HR	0.31	<0.001	0.29	0.09	10.4	<0.001
	Age (ln)	0.15	<0.01	0.15
	Sex	0.10	0.08	0.10
nLF	HR	0.31	<0.001	0.30	0.10	10.8	<0.001
	Age (ln)	0.16	<0.01	0.15
	Sex	0.10	0.07	0.10
nHF	HR	-0.31	<0.001	-0.30	0.10	10.8	<0.001
	Age (ln)	-0.15	<0.01	-0.15
	Sex	-0.10	0.07	-0.10