Abstract: The aim of this study was to investigate the effects of caffeine on reaction time during a specific taekwondo task and athletic performance during a simulated taekwondo contest. Ten taekwondo athletes ingested either 5 mg·kg−1 body mass caffeine or placebo and performed two combats (spaced apart by 20 min). The reaction-time test (five kicks “Bandal Tchagui”) was performed immediately prior to the first combat and immediately after the first and second combats. Caffeine improved reaction time (from 0.42 ± 0.05 to 0.37 ± 0.07 s) only prior to the first combat (P = 0.004). During the first combat, break times during the first two rounds were shorter in caffeine ingestion, followed by higher plasma lactate concentrations compared with placebo (P = 0.029 and 0.014, respectively). During the second combat, skipping-time was reduced, and relative attack times and attack/skipping ratio was increased following ingestion of caffeine during the first two rounds (all P < 0.05). Caffeine resulted in no change in combat intensity parameters between the first and second combat (all P > 0.05), but combat intensity was decreased following placebo (all P < 0.05). In conclusion, caffeine reduced reaction time in non-fatigued conditions and delayed fatigue during successive taekwondo combats.
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Santos, V.G.F.; Santos, V.R.F.; Felippe, L.J.C.; Almeida Jr., J.W.; Bertuzzi, R.; Kiss, M.A.P.D.M.; Lima-Silva, A.E. Caffeine Reduces Reaction Time and Improves Performance in Simulated-Contest of Taekwondo. Nutrients 2014, 6, 637-649.
Santos VGF, Santos VRF, Felippe LJC, Almeida Jr. JW, Bertuzzi R, Kiss MAPDM, Lima-Silva AE. Caffeine Reduces Reaction Time and Improves Performance in Simulated-Contest of Taekwondo. Nutrients. 2014; 6(2):637-649.
Santos, Victor G.F.; Santos, Vander R.F.; Felippe, Leandro J.C.; Almeida Jr., Jose W.; Bertuzzi, Rômulo; Kiss, Maria A.P.D.M.; Lima-Silva, Adriano E. 2014. "Caffeine Reduces Reaction Time and Improves Performance in Simulated-Contest of Taekwondo." Nutrients 6, no. 2: 637-649.