Table 2.
Transfer function estimates in the macrocirculatory blood pressure – middle cerebral artery blood flow velocity system in controls and patients.
| Controls (n = 49) | Patients Left: n = 66; right: n = 65) |
T-Test | |
|---|---|---|---|
| Coherence | |||
| -VLF |
L, 0.51 ± 0.15 R, 0.49 ± 0.15 |
L, 0.54 ± 0.17 R, 0.56 ± 0.16 |
ns ns |
| -LF |
L, 0.72 ± 0.14 R, 0.71 ± 0.13 |
L, 0.68 ± 0.17 R, 0.50 ± 0.17 |
ns ns |
| -HF |
L, 0.62 ± 0.15 R, 0.65 ± 0.13 |
L, 0.62 ± 0.15 R, 0.65 ± 0.13 |
ns ns |
| Gain (cm/s / mm Hg) | |||
| -VLF |
L, 0.24 ± 0.22 R, 0.21 ± 0.25 |
L, 0.33 ± 0.27 R, 0.32 ± 0.29 |
df 115, t = −1.94, p = 0.05, d = 0.36 df 113, t = −2.23; p < 0.05, d = 0.40 |
| -LF |
L, 0.52 ± 0.25 R, 0.52 ± 0.22 |
L, 0.50 ± 0.23 R, 0.49 ± 0.21 |
ns ns |
| -HF |
L, 0.58 ± 0.31 R, 0.59 ± 0.35 |
L, 0.59 ± 0.23 R, 0.59 ± 0.25 |
ns ns |
| Gain (%/mm Hg) | |||
| -VLF |
L, 0.32 ± 0.29 R, 0.34 ± 0.32 |
L, 0.56 ± 0.44 R, 0.59 ± 0.49 |
df 115, t = −3.156, p < 0.005, d = 0.64 df 113, t = −2.99, p < 0.005, d = 0.60 |
| -LF |
L, 0.84 ± 0.46 R, 0.86 ± 0.38 |
L, 0.89 ± 0.37 R, 0.87 ± 0.34 |
ns ns |
| -HF |
L, 0.91 ± 0.50 R, 0.96 ± 0.51 |
L, 1.09 ± 0.40 R, 1.11 ± 0.36 |
df 115,t = −2.161, p < 0.05, d = 0.36 df 113, t = −1.801, p = 0.07, d = 0.29 |
| Phase (°) | |||
| -VLF |
L, −61 ± 20 R,−60 ± 21 |
L, −48 ± 20 R, −44 ± 17 |
df 115, t = 3.696, p < 0.001, d = 0.65 df=113, t = 4.290, p < 0.001, d = 0.83 |
| -LF |
L, −48 ± 20 R, −44 ± 17 |
L, −34 ± 14 R, −35 ± 14 |
df 115, t = 2.769, p < 0.01, d = 0.81 df 113, t = 2.013, p < 0.05, d = 0.57 |
| -HF |
L, −16 ± 22 R, −10 ± 20 |
L, −13 ± 13 R, −13 ± 13 |
ns ns |
VLF: very low frequency; LF: low frequency; HF: high frequency; L: left; R: right.