. 2014 Dec 15;17(2):118–125. doi: 10.1111/jch.12459

Table 4.

Association Between Two‐Dimensional Left Ventricular Mechanics and Heart Rate Variability Parameters (Adjusted for Sex and BMI)

	SDNN, ms		Ln rMSSD, ms		Ln 24‐h LF, ms²		Ln 24‐h HF, ms²
	Correlation	Multivariate regression	Correlation	Multivariate regression	Correlation	Multivariate regression	Correlation	Multivariate regression
	r	β	r	β	r	β	r	β
Model 1
Age, y	−0.205	–	−0.143	–	−0.301^a	−0.121	−0.188	–
Systolic BP, mm Hg	−0.108	–	−0.09	–	−0.119	–	−0.12	–
LV mass index, g/m^2.7	−0.187	–	−0.253^a	−0.16	−0.295^a	−0.086	−0.263^a	−0.146
E/ $e_{m}^{'}$ ratio	−0.364^b	−0.31^a	−0.27^a	−0.171	−0.47^b	−0.31^a	−0.297^a	−0.152
2DE LV longitudinal strain, %	0.418^b	0.37^b	0.315^b	0.278^a	0.52^b	0.37^b	0.378^b	0.32^b
2DE LV circumferential strain, %	0.389^b	0.32^b	0.278^a	0.203	0.46^b	0.227	0.32^b	0.206
Torsion, °/cm	0.355^b	0.215	0.218	–	0.322^a	0.179	0.227	–
Untwisting rate, °/s	0.311^b	0.186	0.186	–	0.26	–	0.211	–
r²		0.55		0.4		0.53		0.41

Abbreviations: 2DE, two‐dimensional; BMI, body mass index; BP, blood pressure; HF, high‐frequency domain (0.15–0.40 Hz); E, early diastolic mitral flow (pulse Doppler); e′, average of the peak early diastolic relaxation velocity (e′) of the septal and lateral mitral annulus (tissue Doppler); LF, low‐frequency domain (0.04–0.15 Hz); LV, left ventricular; rMSSD, root mean square of the difference between the coupling intervals of adjacent R‐R intervals; SDNN, standard deviation of all normal RR intervals. ^a P<.05. ^b P<.01.