Table 1.
Baseline subject characteristics
| Young | Old | p (young versus old) | |
|---|---|---|---|
| Number of subjects | 14 | 15 | |
| Age, y | 30 (1.5) | 74 (1.4) | |
| MAP, mmHg | 78 (3) | 94 (5) | .007 |
| HR, bpm | 62 (3) | 61 (2) | ns |
| ACA | |||
| BFV, cm/sec | 65 (3) | 51 (2.5) | .009 |
| CVR, (mmHg sec/cm) | 1.2 (0.04) | 2.0 (0.2) | .0001 |
| VR, (%ΔBFV/mmHg) | 1.7 (0.2) | 1.3 (0.2) | ns |
| ARI | 6.0 (0.8) | 6.0 (0.5) | ns |
| %ΔCVR | -14.5 (3.4) | -10.2 (3.1) | ns |
| PCA | |||
| BFV, cm/sec | 46 (6) | 37 (3.3) | ns |
| CVR, (mmHg sec/cm) | 2.0 (0.3) | 2.9 (0.3) | .03 |
| VR, (%ΔBFV/mmHg) | 1.6 (0.2) | 1.4 (0.3) | ns |
| ARI | 5.0 (0.6) | 6.0 (0.5) | ns |
| %ΔCVR | -14.5 (7.7) | -11.7 (3) | ns |
All values are means (SEM). %ΔCVR indicates the percent change in CVR during the thigh-cuff test and it is used as another measure of autoregulation in addition to ARI.