. 2017 Feb 17;10:57–64. doi: 10.2147/DMSO.S123935

Table 4.

Spearman’s correlation between HRV and anthropometric/cardiorespiratory/biochemical variables in normal weight group (n=29)

Variables		Age	BMI	PR	SBP	DBP	WC	HC	WHR	FS
SDNN (ms)	Rho	0.131	0.078	0.009	−0.044	−0.099	−0.208	−0.228	−0.205	0.074
	p-Value	0.497	0.688	0.965	0.823	0.610	0.279	0.234	0.287	0.703
RMSSD (ms)	Rho	−0.050	0.034	0.089	−0.088	−0.035	−0.056	−0.138	−0.044	−0.017
	p-Value	0.798	0.862	0.646	0.649	0.857	0.773	0.475	0.821	0.931
NN50 count	Rho	0.033	0.150	0.177	−0.034	0.018	0.039	−0.067	0.039	−0.190
	p-Value	0.864	0.437	0.358	0.860	0.924	0.843	0.728	0.839	0.323
PNN50%	Rho	−0.024	0.044	0.078	−0.074	−0.018	−0.066	−0.151	−0.063	−0.076
	p-Value	0.902	0.823	0.689	0.704	0.926	0.732	0.435	0.747	0.695
LF ms²	Rho	0.040	0.007	0.029	0.003	−0.015	−0.077	−0.081	−0.136	0.102
	p-Value	0.838	0.971	0.883	0.986	0.937	0.692	0.675	0.481	0.597
HF ms²	Rho	0.197	0.055	0.129	−0.021	−0.052	−0.259	−0.166	−0.302	0.112
	p-Value	0.306	0.779	0.504	0.914	0.790	0.175	0.390	0.111	0.563
LF nu	Rho	−0.211	−0.069	−0.204	0.064	−0.119	0.138	−0.062	0.116	0.015
	p-Value	0.273	0.722	0.290	0.743	0.539	0.474	0.750	0.549	0.939
HF nu	Rho	0.211	0.069	0.204	−0.064	0.119	−0.138	0.062	−0.116	−0.015
	p-Value	0.273	0.722	0.290	0.743	0.539	0.474	0.750	0.549	0.939
LF/HF	Rho	−0.195	−0.142	−0.206	0.019	−0.129	0.173	0.123	0.103	0.020
	p-Value	0.312	0.462	0.284	0.923	0.503	0.368	0.527	0.594	0.918
SD1	Rho	−0.055	0.013	0.062	−0.118	−0.041	−0.069	−0.136	−0.056	0.000
	p-Value	0.777	0.946	0.750	0.544	0.832	0.723	0.482	0.773	0.999
SD2	Rho	0.166	0.067	−0.015	−0.058	−0.152	−0.238	−0.245	−0.232	0.087
	p-Value	0.389	0.731	0.939	0.764	0.430	0.214	0.200	0.226	0.653
SD1/SD2	Rho	−0.087	0.037	0.281	−0.054	0.131	0.271	0.127	0.274	−0.146
	p-Value	0.655	0.850	0.140	0.781	0.500	0.154	0.512	0.150	0.451

Abbreviations: BMI, body mass index; PR, pulse rate (beats/min); DBP, diastolic blood pressure; FS, fasting blood sugar; HC, hip circumference; HF, high frequency; FH nu, high frequency normalized unit; HRV, heart rate variability; LF, low frequency; LF/HF, low frequency:high frequency ratio; LF nu, low frequency normalized unit; NN50 count, number of RR intervals that differ by >50 ms; PNN50%, percentage of consecutive RR intervals that differ by >50 ms; RMSSD, root mean square of differences of successive RR intervals; SBP, systolic blood pressure; SD1, Poincare plot SD1; SD1/SD2, SD1:SD2 ratio; SD2, Poincare plot SD2; SDNN, standard deviation of all RR intervals; WC, waist circumference; WHR, waist–hip ratio.