XXXX Ingestion Increases Estimated Glycolytic Metabolism during Taekwondo Combat Simulation but Does Not Improve Performance or Parasympathetic Reactivation.

@entity1989 @entity5834 @entity880 @entity855
OBJECTIVES: The aim of this study was to evaluate the effect of @entity5834 ingestion on performance and estimated energy system contribution during simulated taekwondo combat and on post-exercise parasympathetic reactivation. METHODS: Ten taekwondo athletes completed two experimental sessions separated by at least 48 hours. Athletes consumed a capsule containing either @entity5834 (5 mg   kg-1) or placebo (cellulose) one hour before the combat simulation (3 rounds of 2 min separated by 1 min passive recovery), in a double-blind, randomized, repeated-measures crossover design. All simulated combat was filmed to quantify the time spent fighting in each round. @entity880 concentration and rating of perceived exertion were measured before and after each round, while heart rate (HR) and the estimated contribution of the oxidative (WAER), @entity855 -PCr (WPCR), and glycolytic (W[La-]) systems were calculated during the combat simulation. Furthermore, parasympathetic reactivation after the combat simulation was evaluated through 1) taking absolute difference between the final HR observed at the end of third round and the HR recorded 60-s after (HRR60s), 2) taking the time constant of HR decay obtained by fitting the 6-min post-exercise HRR into a first-order exponential decay curve (HRR  ), or by 3) analyzing the first 30-s via logarithmic regression analysis (T30). RESULTS: @entity5834 ingestion increased estimated glycolytic energy contribution in relation to placebo (12.5    1.7 kJ and 8.9    1.2 kJ, P = 0.04). However, @entity5834 did not improve performance as measured by attack number (CAF: 26. 7    1.9; @entity1989 : 27.3    2.1, P = 0.48) or attack time (CAF: 33.8    1.9 s; @entity1989 : 36.6    4.5 s, P = 0.58). Similarly, RPE (CAF: 11.7    0.4 a.u.; @entity1989 : 11.5    0.3 a.u., P = 0.62), HR (CAF: 170    3.5 bpm; @entity1989 : 174.2 bpm, P = 0.12), oxidative (CAF: 109.3    4.5 kJ; @entity1989 : 107.9 kJ, P = 0.61) and @entity855 -PCr energy contributions (CAF: 45.3    3.4 kJ; @entity1989 : 46.8    3.6 kJ, P = 0.72) during the combat simulation were unaffected. Furthermore, T30 (CAF: 869.1    323.2 s; @entity1989 : 735.5    232.2 s, P = 0.58), HRR60s (CAF: 34    8 bpm; @entity1989 : 38    9 bpm, P = 0.44), HRR   (CAF: 182.9    40.5 s, @entity1989 : 160.3    62.2 s, P = 0.23) and HRRamp (CAF: 70.2    17.4 bpm; @entity1989 : 79.2    17.4 bpm, P = 0.16) were not affected by @entity5834 ingestion. CONCLUSIONS: @entity5834 ingestion increased the estimated glycolytic contribution during taekwondo combat simulation, but this did not result in any changes in performance, perceived exertion or parasympathetic reactivation.
