Table 3.
Effect of caffeine or placebo on the total amount of work, mean power and energy expenditure during 10 min of self-selected intensity cycling (Phase B). Values are means (±SD, n=10).
| Time | Placebo | Caffeine | Mean change (%) ± 90% confidence limits |
P | |
|---|---|---|---|---|---|
|
Workdone (J·kg-1) |
5 min | 423 (85) | 470 (95) | .55 (.52) | |
| 10 min | 410 (74) | 406 (49) | -.05 (.67) | ||
| Total | 833 (142) | 876 (109) | -.06 (.38) | .19 | |
| Mean power (Watts) | 5 min | 86 (29) | 92 (29) | .19 (.36) | |
| 10 min | 84 (23) | 90 (28) | .28 (.45) | ||
| Overall | 85 (25) | 90 (26) | -.14 (.60) | .92 | |
| Energy | 5 min | 28 (7) | 31 (8) | .34 (.40) | |
| (kJ·min-1) | 10 min | 30 (8) | 32 (8) | .33 (.47) | |
| Energy (kJ) | Total | 289 (280) | 314 (302) | .17 (.50) | .93 |
P indicates interaction effect of time and trial.