Table 2. 24-hour ambulatory ECG characteristics of patients with DM1 and control group.
| Characteristics | Findings | |
| DM1 patients (n = 20, ± SD) | controls (n = 15, ± SD) | |
| Average heart rate, beats per minute | 74.5 ± 13.8 | 75.1 ± 6.9 |
| Time domain analysis (24-hour recordings) | ||
| SDNN (ms) | 135.8 ± 43.4* | 179.1 ± 42.2* |
| SDANN (ms) | 127.8 ± 47.9 | 160.6 ± 44.7 |
| RMSSD (ms) | 34.6 ± 13.6 | 38.6 ± 17.8 |
| Frequency domain analysis (5 minute supine, resting) | ||
| Low frequency power (ms2) | 715.4 ± 445.7 | 1049.4 ± 454.2 |
| High frequency power | 255.5 ± 177.0 | 359.1 ± 268.1 |
| Total power | 3043.4 ± 1556.3* | 4709.6 ± 2093.9* |
| Low frequency/high frequency ratio | 3.4 ± 1.9 | 4.5 ± 2.1 |
SD: standard deviation, SDNN: SD of the NN intervals, SDANN: SD of the mean 5-minute NN intervals, RMSSD: square root of the mean of the sum of the squares of the NN interval
*:
p < 0.05