Table 2. CBF, CMRO2, and OEF mean values in different age groups.
|
Young |
Middle age |
Old |
||||
|---|---|---|---|---|---|---|
| Left | Right | Left | Right | Left | Right | |
| CBF | ||||||
| GM | 49 (7.3) | 51 (8.3) | 48 (7.1) | 49 (7.8) | 46 (7.2) | 47 (8.2) |
| F-M1 | 52 (6.2) | 54 (7.0) | 48 (5.7) | 50 (6.4) | 48 (5.2) | 48 (6.3) |
| P-S1 | 52 (6.5) | 53 (7.2) | 50 (5.7) | 50 (6.8) | 49 (5.9) | 49 (6.9) |
| T | 47 (6.7) | 48 (7.1) | 46 (6.6) | 47 (7.2) | 43 (7.3) | 44 (7.5) |
| O | 50 (7.1) | 53 (7.7) | 53 (7.2) | 55 (7.7) | 51 (6.3) | 53 (7.0) |
| M1S1 | 49 (6.4) | 49 (7.5) | 47 (5.9) | 47 (6.7) | 47 (5.1) | 46 (6.6) |
| CMRO2 | ||||||
| GM | 176 (28) | 178 (31) | 174 (28) | 175 (32) | 168 (29) | 169 (32) |
| F-M1 | 175 (22) | 180 (23) | 172 (21) | 171 (22) | 168 (20) | 168 (21) |
| P-S1 | 185 (23) | 186 (23) | 181 (19) | 185 (24) | 177 (22) | 180 (26) |
| T | 169 (27) | 173 (28) | 167 (28) | 168 (29) | 159 (28) | 164 (29) |
| O | 196 (29) | 209 (34) | 202 (30) | 212 (33) | 197 (30) | 207 (33) |
| M1S1 | 176 (21) | 175 (26) | 173 (20) | 170 (22) | 173 (23) | 164 (23) |
| OEF | ||||||
| GM | 0.40 (0.05) | 0.40 (0.05) | 0.42 (0.04) | 0.41 (0.05) | 0.43 (0.05) | 0.43 (0.05) |
| F-M1 | 0.38 (0.04) | 0.37 (0.04) | 0.41 (0.04) | 0.40 (0.04) | 0.42 (0.04) | 0.41 (0.04) |
| P-S1 | 0.40 (0.04) | 0.39 (0.04) | 0.42 (0.04) | 0.42 (0.04) | 0.43 (0.04) | 0.43 (0.04) |
| T | 0.41 (0.05) | 0.40 (0.05) | 0.42 (0.05) | 0.41 (0.04) | 0.44 (0.05) | 0.44 (0.05) |
| O | 0.44 (0.05) | 0.45 (0.05) | 0.44 (0.04) | 0.44 (0.04) | 0.45 (0.05) | 0.45 (0.06) |
| M1S1 | 0.40 (0.04) | 0.40 (0.04) | 0.42 (0.04) | 0.42 (0.04) | 0.43 (0.05) | 0.42 (0.04) |
CBF, cerebral blood flow; CMRO2, cerebral metabolic rate of oxygen consumption; F-M1, frontal lobe without primary motor area; GM, cortical gray matter; M1S1, primary motor and somatosensory area; O, occipital lobe; OEF, oxygen extraction fraction; P-S1, parietal lobe without primary somatosensory area; T, temporal lobe.
Mean (s.d.) parametric values in different age groups; young 21 to 39, middle age 40 to 59, and old 60 to 81 years, shown for each hemisphere. CBF (mL/100 g per minute), CMRO2 (μmol/100 g per minute), OEF is a ratio.