Table 2.

Adjusted regression coefficient of HRV in association with 1SD increase in cMetS and its components.

	HRV Index

	Log-HF (ms²) β (SE)	Log LF (ms²) β (SE)	LF/HF ratio β (SE)	SDNN (ms) β (SE)	RMSSD (ms) β (SE)	HR (bpm) β (SE)
cMetS	−0.10 (0.02)^**	−0.07 (0.01)^**	0.08 (0.02)^**	−1.97 (0.50)^**	−1.70 (0.72)^*	1.40 (0.26)^**
WC	−0.07 (0.02)^**	−0.06 (0.01)^**	0.03 (0.02)	−1.88 (0.53)^**	−0.82 (0.77)	1.02 (0.28)^**
MAP	−0.08 (0.02)^**	−0.05 (0.01)^**	0.06 (0.02)^**	−1.98 (0.53)^**	−1.80 (0.76)^*	1.13 (0.27)^**
Log HOMA-IR	−0.06 (0.02)^**	−0.05 (0.01)^**	0.01 (0.02)	−1.47 (0.52)^**	−1.37 (0.75)	1.33 (0.27)^**
TG	−0.14 (0.02)^**	−0.09 (0.01)^**	0.12 (0.02)^**	−3.56 (0.50)^**	−2.85 (0.73)^**	2.00 (0.26)^**
HDL	0.03 (0.02)	0.04 (0.01)^**	0.02 (0.02)	2.59 (0.54)^**	1.21 (0.80)	−0.49 (0.29)

Abbreviations: BPM, beats per minute; cMetS, continuous metabolic syndrome score; HDL, high-density lipoprotein; HF, high frequency power; HOMA-IR, homeostasis model assessment of insulin resistance; HRV, heart rate variability; LF, low frequency power; Log, logarithm; MAP, mean arterial pressure; RMSSD, square root of the mean of the sum of the squares of differences between adjacent RR intervals; SDNN, standard deviation of all RR intervals; TG, triglycerides; WC, waist circumference.

The model was adjusted for age, race, and gender.

* and **, P < 0.05; and P < 0.01, respectively