Table 3. Peak percentage change in peripheral and cerebral haemodynamic parameters and ETCO2 at T2 (25-30 seconds), and T3 (30-40 seconds) for four memory tasks (M1-M4) from the ACE-III. Data are mean (standard deviation), with significance testing by independent t-tests.
| Parameter | Younger | Older | P value | |||
|---|---|---|---|---|---|---|
| N | 29 | 25 | ||||
| M1 | T2 | T3 | T2 | T3 | T2 | T3 |
| CBFv Non-dominant | 3.07 (9.03) | 0.49 (5.83) | 8.04 (10.73) | -0.01 (9.33) | 0.07 | 0.82 |
| CBFv dominant | 2.17 (9.16) | -0.03 (8.21) | 8.38 (9.27) | -1.01 (5.32) | 0.017 | 0.60 |
| MAP | 4.49 (6.13) | 3.76 (5.54) | 3.86 (4.55) | 0.72 (6.01) | 0.67 | 0.60 |
| HR | -0.95 (6.76) | -1.17 (8.48) | 2.82 (5.27) | -0.03 (7.24) | 0.028 | 0.06 |
| ETCO2 | 0.45 (4.62) | -0.43 (4.24) | -0.89 (3.79) | -1.67 (3.52) | 0.26 | 0.25 |
| M2 | ||||||
| CBFv Non-dominant | 2.60 (10.29) | 4.06 (7.90) | 8.07 (9.62) | 6.40 (11.16) | 0.05 | 0.37 |
| CBFv dominant | 4.60 (11.48) | 5.70 (7.45) | 7.71 (8.33) | 5.52 (9.18) | 0.27 | 0.94 |
| MAP | 3.61 (5.50) | 4.68 (9.79) | 4.67 (11.07) | 6.50 (9.29) | 0.45 | 0.49 |
| HR | 2.46 (10.05) | 1.62 (5.06) | 4.24 (5.11) | 5.18 (4.50) | 0.67 | 0.009 |
| ETCO2 | 0.86 (7.06) | 2.96 (5.60) | -2.77 (9.45) | -0.19 (10.84) | 0.11 | 0.18 |
| M3 | ||||||
| CBFv Non-dominant | 5.14 (8.58) | 3.35 (7.05) | 10.19 (8.44) | 5.57 (8.27) | 0.036 | 0.30 |
| CBFv dominant | 6.61 (8.94) | 5.45 (7.38) | 10.96 (7.99) | 6.98 (6.47) | 0.07 | 0.43 |
| MAP | 5.23 (4.69) | 2.74 (5.18) | 5.62 (5.92) | 6.05 (5.43) | 0.11 | 0.028 |
| HR | 2.02 (6.01) | 4.24 (4.98) | 4.79 (6.44) | 5.13 (5.24) | 0.79 | 0.53 |
| ETCO2 | 1.84 (5.67) | 0.34 (5.41) | 0.34 (8.47) | -0.47 (8.37) | 0.46 | 0.67 |
| M4 | ||||||
| CBFv Non-dominant | 8.16 (9.11) | 4.40 (8.65) | 13.26 (10.92) | 5.68 (7.99) | 0.07 | 0.58 |
| CBFv dominant | 8.42 (8.86) | 3.32 (8.41) | 15.93 (8.86) | 8.20 (7.85) | 0.003 | 0.03 |
| MAP | 4.24 (4.58) | 6.45 (6.59) | 6.00 (5.79) | 7.00 (5.52) | 0.17 | 0.74 |
| HR | 3.21 (8.51) | 1.89 (2.99) | 5.84 (4.96) | 3.20 (6.92) | 0.22 | 0.38 |
| ETCO2 | -0.69 (5.61) | -1.03 (6.98) | -1.86 (3.91) | -3.80 (6.63) | 0.39 | 0.14 |