Fig. 6From: A Randomised, Placebo-Controlled, Crossover Study Investigating the Optimal Timing of a Caffeine-Containing Supplement for Exercise PerformanceAlertness (a) and paraesthesia (b) during the PLA, DUR, ONS and PRE trials. Data are mean for all participants ± SEM. *, significant difference from − 25; #, significant difference from − 35Back to article page