Figure 4

Dynamics of data acquisition. Placebo–Placebo (PP), Placebo–Caffeine (PC) and Caffeine–Caffeine (CC) conditions were tested in 16 km time Trial (16 km TT) performance and HRV analysis were done pre supplementation (HRV-SP PRE suppl), post supplementation (HRV-SP POST suppl) during 16 km TT (HRV-TT) and post 16 km TT (HRV-SP Post).