Table 4. Peak percentage change in peripheral and cerebral haemodynamic parameters and ETCO2 at T2 (25-30 seconds), and T3 (30-40 seconds) for four visuospatial tasks (V1-V4) from the ACE-III. Data are mean (standard deviation), with significance testing by independent t-tests.
| Parameter | Younger | Older | P value | |||
|---|---|---|---|---|---|---|
| N | 29 | 25 | ||||
| V1 | T2 | T3 | T2 | T3 | T2 | T3 |
| CBFv Non-dominant | 8.88 (9.24) | 5.87 (8.32) | 12.83 (5.69) | 11.89 (6.60) | 0.07 | 0.005 |
| CBFv dominant | 9.28 (8.92) | 6.38 (7.62) | 13.64 (7.47) | 12.93 (8.92) | 0.06 | 0.005 |
| MAP | 2.64 (3.82) | -1.07 (4.82) | 5.69 (6.50) | 3.56 (7.55) | 0.07 | 0.043 |
| HR | 4.82 (7.63) | 4.44 (8.29) | 8.02 (4.90) | 8.65 (6.30) | 0.046 | 0.009 |
| ETCO2 | 0.11 (3.76) | -0.50 (4.04) | -0.12 (4.07) | -1.32 (3.90) | 0.83 | 0.45 |
| V2 | ||||||
| CBFv Non-dominant | 6.30 (8.72) | 7.67 (8.79) | 11.30 (7.77) | 9.51 (8.67) | 0.032 | 0.45 |
| CBFv dominant | 7.52 (9.25) | 8.51 (9.80) | 13.20 (9.17) | 13.05 (10.14) | 0.028 | 0.10 |
| MAP | 2.80 (3.92) | 1.47 (4.71) | 5.74 (6.29) | 6.57 (6.96) | 0.039 | 0.003 |
| HR | 2.31 (5.78) | 1.82 (6.48) | 5.50 (5.17) | 7.30 (6.18) | 0.042 | 0.002 |
| ETCO2 | 0.68 (6.56) | 0.71 (8.57) | 1.01 (4.46) | -0.55 (4.25) | 0.83 | 0.51 |
| V3 | ||||||
| CBFv Non-dominant | 4.19 (8.75) | 5.20 (8.65) | 10.63 (7.67) | 11.72 (10.31) | 0.006 | 0.015 |
| CBFv dominant | 6.44 (9.62) | 4.42 (8.71) | 10.92 (8.45) | 10.57 (10.05) | 0.08 | 0.019 |
| MAP | 0.87 (3.62) | 1.25 (3.33) | 3.60 (5.53) | 2.57 (10.14) | 0.023 | 0.002 |
| HR | -0.35 (6.09) | -0.47 (5.25) | 3.27 (5.08) | 4.34 (5.53) | 0.034 | 0.54 |
| ETCO2 | 0.80 (9.19) | 1.67 (8.91) | 0.36 (3.46) | 0.06 (3.24) | 0.82 | 0.40 |
| V4 | ||||||
| CBFv Non-dominant | 5.21 (9.76) | 2.70 (7.15) | 9.02 (8.86) | 4.35 (7.15) | 0.14 | 0.40 |
| CBFv dominant | 5.83 (9.57) | 3.83 (8.48) | 9.54 (8.96) | 3.80 (7.96) | 0.15 | 0.99 |
| MAP | 0.43 (4.86) | 0.35 (3.64) | 4.19 (5.31) | -0.20 (3.30) | 0.08 | 0.56 |
| HR | -0.13 (6.52) | -0.01 (4.87) | 2.66 (4.57) | 1.97 (3.45) | 0.009 | 0.10 |
| ETCO2 | 2.47 (4.59) | 0.97 (6.36) | 0.22 (5.13) | -1.20 (5.90) | 0.09 | 0.20 |