Table 3.
Transfer function analysis parameters and autoregulation index by recording
| Parameter | Standing | SSMD | SSMS | p‐value |
|---|---|---|---|---|
| ARI | 6.03 (5.20–6.49) | 4.46 a (4.03–5.22) | 5.96 (5.40–6.69) | <.01 |
| Coherence | 0.557 (0.274–0.714) | 0.987 (0.977–0.993) | 0.970 b (0.912–0.988) | <.001 |
| Gain (%/%) | 1.16 (0.89–1.40) | 1.55 c (1.27–1.92) | 1.46 c (1.24–2.02) | <.001 |
| Phase (radians) | 0.87 (0.72–1.14) | 0.64 a (0.51–0.71) | 0.94 (0.76–1.16) | <.001 |
| BP power (mmHg)2/Hz | 64.18 (24.31–127.17) | 5218.5 a (2752.1–12973.3) | 1453.7 b (444.8–2800.4) | <.001 |
| CBFv power (cm/s)2/Hz | 58.76 (39.32–94.83) | 6802.9 c (4812.3–10924.4) | 1110.2 b (404.6–2281.1) | <.001 |
Values are given as median (IQR). TFA and power spectral parameters were extracted at the frequency of squatting (0.05 Hz). p‐value determined by repeated measure Friedman test. Paired comparisons by Wilcoxon signed‐rank test.
Abbreviation: ARI, autoregulation index.
a
p < .01 compared to baseline standing and SSMS
b
p < .01 compared to both baseline standing and SSMD
c
p < .01 compared to baseline standing.