CVR Obtained for Rest and Stress Using 4 Levels of Plasma Caffeine Concentration
| Plasma caffeine concentration (mg/L) | ||||
|---|---|---|---|---|
| PCC | ≤1 | 1 < x ≤ 3 | 3 < x ≤ 5 | >5 |
| Rest | ||||
| Women | 82.9 ± 19.4 (31) | 85.7 ± 16.8 (8) | 77.0 ± 18.5 (6) | 92.6 ± 21.1 (29) |
| Men | 105.5 ± 30.7* (38) | 101.3 ± 26.5 (12) | 102.1 ± 27.6 (14) | 152.9 ± 25.9*† (14) |
| Stress | ||||
| Women | 25.8 ± 5.9 | 23.0 ± 7.2 | 21.8 ± 1.4 | 23.6 ± 8.8 |
| Men | 27.5 ± 8.2 | 33.0 ± 15.2 | 45.2 ± 25.6*† | 51.8 ± 14.8*† |
* Significant differences for men and women.
†Sex-specific differences between the baseline scan (0 mg) and the respective plasma caffeine concentrations.
Numbers given in parentheses for the rest scans indicate the number of MPI sessions fulfilling the criteria. Differences were considered significant for P < 0.05.
PCC = plasma caffeine concentration.