Table 3.
Correlation analysis between frequency-domain parameters of HRV, mean interstitial tissue glucose, and indices of glycemic variability.
| Variable | Mean interstitial tissue glucose | MAGE | SD of mean glucose | M-value | ||||
|---|---|---|---|---|---|---|---|---|
| r | P | r | P | r | P | r | P | |
| TP (t) | −0.25 | 0.09 | −0.14 | 0.37 | −0.29 | 0.052 | −0.30 | 0.047 |
| TP (n) | −0.25 | 0.09 | −0.13 | 0.39 | −0.29 | 0.047 | −0.31 | 0.034 |
| LF (t) | −0.19 | 0.22 | −0.03 | 0.82 | −0.14 | 0.35 | −0.13 | 0.38 |
| LF (n) | −0.20 | 0.19 | −0.02 | 0.90 | −0.14 | 0.36 | −0.14 | 0.35 |
| HF (t) | −0.08 | 0.59 | 0.05 | 0.76 | −0.10 | 0.51 | −0.16 | 0.29 |
| HF (n) | −0.09 | 0.57 | 0.07 | 0.63 | −0.09 | 0.56 | −0.16 | 0.28 |
| LF/HF (t) | −0.13 | 0.37 | −0.11 | 0.46 | −0.05 | 0.76 | 0.05 | 0.73 |
| LF/HF (n) | −0.11 | 0.48 | −0.12 | 0.44 | −0.04 | 0.81 | 0.07 | 0.67 |
Data are adjusted for HbA1c and duration of diabetes.
All variables are log-transformed due to skewness.
(t): Total; (n): night
Night period: 23:00–06:00
TP: Variance of all normal-to-normal NN intervals
LF: Power in the low frequency range
HF: Power in the high frequency range
LF/HF: Ratio LF/HF.