Results of autonomic nervous system tests in the study groups
| Test | Variable | Normal subjects (n=8) | IDDM patients (n=35) |
|---|---|---|---|
| Controlled breathing | RMSSD (ms) | 38.3 (13.7) | 30.3 (35.0) |
| Controlled breathing | TP (ms2) | 2969 (2438) | 1860 (4397) |
| Controlled breathing | LF (ms2) | 545 (300) | 398 (630) |
| Controlled breathing | HF (ms2) | 618 (366) | 427 (488) |
| Controlled breathing | LF/HF ratio | 1.0 (0.7) | 1.5 (1.5) |
| Deep breathing | E/I ratio | 1.3 (0.1) | 1.3 (0.2) |
| Valsalva manoeuvre | Valsalva ratio | 1.9 (0.3) | 1.7 (0.3) |
| Orthostatic test, 7 minutes | Systolic blood pressure decrease (mm Hg) | −2.9 (10.0) | −5.6 (12.3) |
↵p<0.05 for IDDM patients v normal subjects. Data are expressed as mean (SD).
RMSSD = square root of the mean of the square of R-R interval differences.
TP = total power.
LF = low frequency.
HF = high frequency component of heart rate variability in spectral analysis.