Table 3. Cerebrovascular parameters.
| Parameters | Young | Old | F value | P value | η2p | Power |
|---|---|---|---|---|---|---|
| Mean (SD) | Mean (SD) | |||||
| Resting MCAv cm s–1 | 64.97 (8.34) | 51.22 (10.47) | 30.59 | .000 | .353 | 1.00 |
| NVCi %ΔMCAv | 21.61 (6.83) | 22.90 (8.19) | .43 | .517 | .008 | .098 |
| Hypercapnia | ||||||
| Baseline | 30.88 (2.74) | 30.32 (2.78) | .461 | |||
| %ΔMCAv/ΔPETCO2 | 2.91 (1.25) | 2.95 (1.49) | .01 | .908 | .000 | .051 |
| Hypocapnia | ||||||
| Baseline | 30.67 (2.31) | 29.52 (2.51) | .092 | |||
| %ΔMCAv/ΔPETCO2 | 1.12 (1.12) | 2.19 (1.38) | 10.60 | .002 | .159 | .892 |
| Pressure-flow %ΔMCAv/%ΔMAP |
.91 (.24) | 1.30 (.27) | 34.03 | .000 | .378 | 1.00 |
Note: MCAv: mean cerebral artery blood flow velocity, NVCi: neurovascular coupling index, PETCO2: partial pressure of arterial carbon dioxide, MAP: mean arterial pressure.