Table 4.
The correlations between depression and baseline HRV and CVC indices.
| Variables | HRV indices | CVC indices | |||||||
|---|---|---|---|---|---|---|---|---|---|
| heart rate | SDNN | LF | lnLF | HF | lnHF | LF/HF ratio | RSA | lnRSA | |
| Total depression score | 0.12* | −0.21*** | −0.19** | −0.32*** | −0.07 | −0.16** | −0.06 | −0.03 | −0.15** |
| Cognitive depression | 0.12* | −0.21*** | −0.20** | −0.31*** | −0.06 | −0.15** | −0.07 | −0.03 | −0.14* |
| Somatic depression | 0.10 | −0.19** | −0.14* | −0.29*** | −0.08 | −0.15** | −0.03 | −0.02 | −0.14* |
*p <0.05, **p <0.01, ***p <0.001.
CVC, cardiac vagal control; HF, high frequency; LF, low frequency; lnLF, natural logarithm of low frequency; lnHF, natural logarithm of high frequency; lnRSA, natural logarithm of respiration sinus arrhythmia; RSA, respiration sinus arrhythmia; SDNN, standard deviation of all normal to normal intervals.