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Nutrients 2014, 6(2), 637-649; doi:10.3390/nu6020637
Article

Caffeine Reduces Reaction Time and Improves Performance in Simulated-Contest of Taekwondo

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 and
1,*
1 Sport Science Research Group, Department of Physical Education and Sports Science (CAV), Federal University of Pernambuco, Pernambuco 55608-680, Brazil 2 Endurance Performance Research Group, School of Physical Education and Sport, University of Sao Paulo, Sao Paulo 05371-140, Brazil
* Author to whom correspondence should be addressed.
Received: 27 December 2013 / Revised: 24 January 2014 / Accepted: 28 January 2014 / Published: 10 February 2014
(This article belongs to the Special Issue Sport and Performance Nutrition)
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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.
Keywords: martial arts; sport; supplementation; ergogenic aid; time and motion studies martial arts; sport; supplementation; ergogenic aid; time and motion studies
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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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.

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