TABLE 3.
Standardized beta coefficients from linear regression models on the associations of body composition measures with standard and corrected HRV parameters.
| RMSSD | pNN50 | SDNN | FFT TP | FFT HF | FFT LF | FFT LF/HF | |
| Model 1: Standard HRV parameters; Confounders†: none | |||||||
| BMI (kg/m2) | −0.207 | −0.240 | –0.158 | –0.117 | −0.214 | –0.018 | 0.283* |
| WC (cm) | –0.120 | –0.148 | –0.052 | –0.042 | –0.125 | 0.024 | 0.201 |
| WC/Height | –0.152 | −0.194 | –0.076 | –0.065 | –0.146 | –0.031 | 0.159 |
| DXA FMI (kg/m2) | −0.232 | −0.272* | −0.203 | –0.138 | −0.208 | –0.042 | 0.250* |
| DXA BFP (%) | −0.221 | −0.261* | −0.220 | –0.148 | –0.168 | –0.084 | 0.146 |
| DXA FFMI (kg/m2) | –0.062 | –0.067 | –0.005 | –0.019 | –0.122 | 0.048 | 0.225 |
| DXA Total VAT (g) | –0.048 | –0.090 | –0.019 | –0.005 | –0.054 | 0.069 | 0.121 |
| DXA VAT FMI (g) | –0.090 | –0.134 | –0.062 | –0.036 | –0.095 | 0.019 | 0.082 |
| Model 2: Standard HRV parameters; Confounders†: HR | |||||||
| BMI (kg/m2) | –0.034 | –0.058 | 0.003 | 0.046 | –0.052 | 0.131 | 0.242 |
| WC (cm) | –0.003 | –0.026 | 0.057 | 0.067 | –0.015 | 0.122 | 0.168 |
| WC/Height | 0.095 | 0.063 | 0.158 | 0.169 | 0.086 | 0.179 | 0.094 |
| DXA FMI (kg/m2) | –0.028 | –0.059 | –0.015 | 0.055 | –0.015 | 0.135 | 0.201 |
| DXA BFP (%) | –0.008 | –0.039 | –0.026 | 0.051 | 0.035 | 0.097 | 0.086 |
| DXA FFMI (kg/m2) | –0.039 | –0.042 | 0.017 | 0.003 | –0.099 | 0.068 | 0.218 |
| DXA Total VAT (g) | 0.050 | 0.013 | 0.075 | 0.100 | 0.043 | 0.132 | 0.092 |
| DXA VAT FMI (g) | 0.111 | 0.074 | 0.131 | 0.159 | 0.103 | 0.159 | 0.023 |
| Model 3: Corrected HRV parameters; Confounders†: years PHV offset | |||||||
| BMI (kg/m2) | 0.026 | –0.042 | 0.010 | 0.109 | –0.014 | 0.140 | 0.198 |
| WC (cm) | 0.107 | –0.006 | 0.101 | 0.156 | 0.065 | 0.129 | 0.112 |
| WC/Height | 0.108 | 0.004 | 0.114 | 0.179 | 0.069 | 0.168 | 0.114 |
| DXA FMI (kg/m2) | 0.012 | –0.058 | –0.018 | 0.117 | 0.016 | 0.136 | 0.163 |
| DXA BFP (%) | 0.012 | –0.055 | –0.036 | 0.105 | 0.058 | 0.085 | 0.061 |
| DXA FFMI (kg/m2) | 0.024 | –0.011 | 0.040 | 0.033 | –0.073 | 0.090 | 0.183 |
| DXA Total VAT (g) | 0.102 | –0.020 | 0.062 | 0.121 | 0.058 | 0.117 | 0.089 |
| DXA VAT FMI (g) | 0.157 | 0.057 | 0.109 | 0.181 | 0.110 | 0.110 | 0.020 |
BMI, body mass index; WC, waist circumference; DXA, dual energy X-ray absorptiometry; FMI, fat mass index; BFP, body fat percentage, FFMI, fat-free mass index; VAT, visceral adipose tissue; PHV, peak height velocity. See full name of all the heart rate variability in time and frequency-domain (units in ms and ms2, respectively) parameters in Table 1. †Confounders on the model were selected by stepwise regression analyses (i.e., all basic confounders considered in the three models were sex, PHV offset, parental education and wave). Additionally, mean HR was introduced as a confounder in the model 2. Stepwise analyses for confounders did not introduced any of the confounders tested in model 1, only mean HR in model 2 and PHV offset in model 3. Bold numbers indicate p < 0.05. *Indicates p < 0.01.