Figure 2. The effects of caffeine on peak power (A) and mean power (B) during the sprint interval exercise and the changes in peak power (C) and mean power (D) from Set 1 to Set 3. Asterisk indicates statistical significance by two-way ANOVA. The values are presented as the means ± SDs (n = 16) for each condition. Each participant’s result is presented in the plot (black circles) in Figure 2C and D.