Table 1 Effect of caffeine or placebo on the total amount of work done, mean power and energy expenditure during 15 min of steady state cycling (Phase A). Values are means (±SD, n = 10).
Time
Placebo
Caffeine
Mean change (%) ± 90% confidence limits
P
Work done (J·kg-1)
5 min
281 (86)
271 (66)
-.11 (.19)
10 min
279 (74)
273 (64)
-.07 (.11)
15 min
277 (73)
280 (81)
.03 (.09)
Total
837 (232)
825 (210)
.05 (.08)
.39
Mean power (Watts)
5 min
55 (15)
54 (15)
-.06 (.20)
10 min
56 (15)
56 (14)
-.03 (.09)
15 min
56 (16)
56 (15)
-.01 (.10)
Overall
57 (16)
55 (14)
-.12 (.14)
.80
Energy (kJ·min-1)
5 min
20 (5)
21 (4)
.20 (.20)
10 min
21 (5)
21 (4)
.08 (.19)
15 min
20 (5)
22 (5)
.48 (.25)
Energy (kJ)
Total
304 (296)
322 (315) *
.25 (.14)
.07
P indicates interaction effect of time and trial.
* indicates a significant difference (p = 0.01) in total energy (kJ) values between trials based on results from a one-way ANOVA analysis.