Table 4.
Breath hold (BH)-induced BOLD signal amplitude change in the younger and older subjects in brain regions active during the motor (FTAP) or cognitive (DSST) task. Values are the voxel average from the activated regions.
| Subject | BH-induced BOLD signal change (%) | |||
|---|---|---|---|---|
| young | old | |||
| FTAP | DSST | FTAP | DSST | |
| 1 | 3.73 | 2.94 | n.a | n.a |
| 2 | 3.71 | 4.48 | 2.59 | 4.86 |
| 3 | 4.74 | 4.63 | 2.44 | 2.81 |
| 4 | 5.57 | 5.49 | 1.80 | 1.96 |
| 5 | 2.43 | 2.08 | 2.22 | 5.84 |
| 6 | 3.52 | 4.08 | 3.7 | 2.52 |
| 7 | 3.50 | 4.43 | 6.32 | 4.91 |
| 8 | 1.84 | 2.73 | 3.17 | 2.78 |
| 9 | 2.70 | 2.63 | 4.19 | 4.14 |
| 10 | 2.65 | 4.25 | 2.74 | 4.45 |
| 11 | 4.01 | 4.79 | 2.06 | 3.06 |
| 12 | 2.06 | 2.19 | 5.62 | 4.52 |
| Mean | 3.37 | 3.72 | 3.35 | 3.80 |
| SD | 1.10 | 1.13 | 1.48 | 1.23 |
| CV | 0.32* | 0.30** | 0.44 | 0.32 |
No significant difference compared to older
*
P< 0.3 and
**
P< 0.8;
Bartlett’s test of equality of variance.