Table 4.
Response (Δ%) of cardiac and peripheral autonomic control evaluated by a linear method using an autoregressive model.
| Tilt_Control (n = 13) | Tilt_tVNS (n = 13) | P | |
|---|---|---|---|
| LINEAR ANALYSIS | |||
| R–R interval | |||
| RRi (%) | −21 (−29–−13) | −23 (−29–−17) | 0.07 |
| Variance (%) | −24 (−51–25) | −42 (−68–40) | 0.46 |
| VLF abs. (%) | −28 (−87–15) | −28 (−72–85) | 0.21 |
| LF n.u. (%) | 63 (32–131) | 52 (30–177) | 0.89 |
| HF n.u. (%) | −70 (−84–−57) | −67 (−87–−60) | 0.71 |
| LF/HF (%) | 669 (226–1017) | 737 (253–1456) | 0.95 |
| Systolic Arterial Pressure | |||
| Variance (%) | 68 (0–102) | 93 (39–137) | 0.50 |
| LF abs. (%) | 229 (151–775) | 404 (112–813) | 0.68 |
| Respiratory Rate | |||
| ù HF (%) | −5 (−14–9) | 6 (1–12) | 0.08 |
Median (25th–75th). tVNS = transcutaneous vagus nerve stimulation; RRi = R–R interval; VLF = very low frequency; LF = low frequency; HF = high frequency; LF/HF = sympathovagal balance; n.u. = normalized unit, ω = central frequency.