Fig. 3

Heart rate (a), rating of perceived of exertion and pain (b) in the Caffeine and Placebo conditions throughout the training. RPE—ratting of perceived exertion; P.Pain—perceived pain. ^ap ≤ 0.48 for this measurement moment s. 20, 40, 80, 100 and 120 min (regardless condition). ^bp = 0.041 for this measurement moment versus 60 min for the Placebo condition. ^cp ≤ 0.05 for this measurement moment versus 100 min for Caffeine. ^dp ≤ 0.044 for this measurement moment versus 80 min and 100 min for Placebo