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

Table 3.

Spearman’s rank correlation between heart rate variability and anthropometric/cardiorespiratory/biochemical variables in obese group (n=30)

Variables Age BMI PR SBP DBP WC HC WHR FS
SDNN (ms) Rho −0.495 −0.016 −0.661 −0.355 −0.287 −0.080 0.008 −0.228 −0.206
p-Value 0.005 0.934 0.000 0.055 0.124 0.674 0.968 0.226 0.274
RMSSD (ms) Rho −0.473 0.179 −0.625 −0.235 −0.225 0.034 0.068 −0.057 −0.323
p-Value 0.008 0.344 0.000 0.210 0.231 0.860 0.721 0.767 0.082
NN50 count Rho −0.473 0.158 −0.638 −0.205 −0.166 −0.010 0.029 −0.091 −0.311
p-Value 0.008 0.405 0.000 0.276 0.380 0.958 0.879 0.633 0.095
PNN50% Rho −0.431 0.056 −0.662 −0.285 −0.256 −0.050 0.041 −0.221 −0.205
p-Value 0.017 0.769 0.000 0.126 0.172 0.791 0.829 0.242 0.277
LF ms2 Rho −0.433 0.000 −0.728 −0.103 −0.055 −138 −0.097 −0.122 −0.183
p-Value 0.017 1.000 0.000 0.587 0.773 0.466 0.610 0.520 0.332
HF ms2 Rho −0.557 0.015 −0.535 −0.426 −0.377 −0.196 −0.069 −0.374 −0.262
p-Value 0.001 0.939 0.002 0.019 0.040 0.299 0.718 0.042 0.163
LF nu Rho 0.361 −0.006 −0.004 0.515 0.452 0.172 −0.008 0.478 0.186
p-Value 0.050 0.976 0.985 0.004 0.012 0.364 0.966 0.008 0.324
HF nu Rho −0.361 0.006 0.004 −0.515 −0.452 −0.172 0.008 −0.478 −0.186
p-Value 0.050 0.976 0.985 0.004 0.012 0.364 0.966 0.008 0.324
LF/HF Rho 0.365 −0.005 −0.001 0.516 0.454 0.135 −0.055 0.479 0.181
p-Value 0.047 0.980 0.994 0.004 0.012 0.476 0.772 0.007 0.339
SD1 Rho −0.400 0.161 −0.606 −0.310 −0.295 0.036 0.131 −0.159 −0.220
p-Value 0.029 0.396 0.000 0.096 0.113 0.849 0.491 0.402 0.242
SD2 Rho −0.489 −0.082 −0.667 −0.372 −0.289 0.080 −0.005 −0.218 −0.219
p-Value 0.006 0.666 0.000 0.043 0.121 0.675 0.979 0.247 0.245
SD1/SD2 Rho −0.144 0.324 −0.325 −0.115 −0.166 0.133 0.199 −0.058 −0.229
p-Value 0.448 0.081 0.080 0.546 0.381 0.482 0.291 0.762 0.224

Notes: DBP in obese individuals showed a significant negative correlation with HF ms2 (r=−0.377, p<0.05) and HF nu (r=−0.452, p<0.05), but it showed a positive correlation with LF nu (r=0.452, p<0.05) and LF/HF ratio (r=0.454, p<0.05). There was a significant positive correlation of WHR with LF nu (r=0.478, p<0.01) and LF/HF ratio (r=0.479, p<0.01), whereas it had a significant negative correlation with high frequency power (HFPR) ms2 (r=−0.374, p<0.05) and HF nu (r=−0.478, p<0.01). Values in bold indicate statistical significance.

Abbreviations: BMI, body mass index; DBP, diastolic blood pressure; FS, fasting blood sugar; HC, hip circumference; HF, high frequency; FH nu, high frequency normalized unit; 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; SD2, Poincare plot SD2; SD1/SD2, SD1:SD2 ratio; SDNN, standard deviation of all RR intervals; WC, waist circumference; WHR, waist–hip ratio; PR, pulse rate (beats/min).