Table 3.

Correlation coefficients between biomarkers and parameters of cardiac autonomic function

Variable	∆ HR	VR	∆DBP	30/15 ratio	∆SBP	mean NN	SDNN	RMSSD	pNN50	TP	LF power	HF power	LF/HF ratio
IL-6	−.03	−.03	−.011	−.011	.11	−.16	−.20	−.10	−.002	−.34*	−.36*	−.17	.009
IL-18	−.18	−.16	−.17	−.04	.007	−.03	−.18	−.28	−.53**	−.25	−.21	−.34*	.21
hsCRP	−.4**	−.008	−.23	−.32*	−.03	.03	−.24	−.40**	−.36	−.35*	−.31*	−42**	.22
NO	.55**	0.05	.10	.46**	.09	.05	.26	.65**	.01	.30*	.13	.32*	−.25
eNOS	.50**	−.006	.10	.46**	.14	−.14	−.06	.43**	−.07	.07	−.002	.17	−.20
ET-1	.55**	−.05	−.09	−.18	−.07	−.02	−.001	−.22*	.03	−.03	−.02	−.18	.22

IL: interleukin; hsCRP: high-sensitivity C-reactive protein; NO: nitric oxide; eNOS: endothelial nitric oxide synthase; ET-1: endothelin-1; mean NN: average of N-N intervals; SDNN: standard deviation of N-N intervals; RMSSD: root mean square of successive differences between adjacent R-R intervals; pNN50: percentage of consecutive N-N intervals that differ by more than 50 ms; TP: total power; LF: low frequency; HF: high frequency; LF/HF ratio: ratio of low and high frequency power; ∆HR: change in heart rate during deep breathing test; VR: valsalva ratio; 30/15 ratio: ratio of R-R interval during 30th and 15th second of the head-up tilt test; ∆DBP: change in diastolic blood pressure during hand grip test; ∆SBP: change in systolic blood pressure during head-up tilt test; *p < .05; **p < .01