Caffeine Ingestion Increases Estimated Glycolytic Metabolism during Taekwondo Combat Simulation but Does Not Improve Performance or Parasympathetic Reactivation
Lopes-Silva JP, Silva Santos JF, Branco BH, Abad CC, Oliveira LF, Loturco I, Franchini E
PloS one · 54 citas
Cómo se estudió
- Diseño
- Ensayo controlado aleatorizado (indexado por PubMed)
- Estudiado en
- Personas
- Resultado principal
- Marcadores de salud y funcionamiento
Quién lo pagó
- Financiación
- Financiación independiente
- Gobierno
- Fundação de Amparo à Pesquisa do Estado de São Paulo
- Subvenciones
- Fundação de Amparo à Pesquisa do Estado de São Paulo (2011/)
Según 1 financiador declarado y la declaración de financiación del texto completo.
Publicación
- Publicado
- 2015-11-05 · PLoS One · vol. 10 · número 11 · pág. e0142078
- Editorial
- Public Library of Science
- Citado
- 77 citas · más que el 95% de estudios similares · 5.0× el promedio de su campo
- Impacto
- Entre el 10 % más citado de su campo
- Referencias
- 36 trabajos
- Acceso
- Acceso abierto (revista) · CC-BY
- Áreas de investigación
- Coffee research and impacts · Muscle metabolism and nutrition · Exercise and Physiological Responses
- Palabras clave
- Caffeine, Ingestion, Crossover study, Rating of perceived exertion, Heart rate, Placebo, Athletes, Blood lactate, Glycolysis, Medicine, Animal science, Chemistry, Internal medicine, Anesthesia, Physical therapy, Blood pressure, Metabolism, Biology
- MeSH
- parasympathetic nervous system, humans, lactic acid, caffeine, exercise test, exercise, cross-over studies, double-blind method, glycolysis, oxygen consumption, heart rate, martial arts, adult, male, athletic performance, young adult, athletes
7 autores
- João Paulo Lopes‐Silva🇧🇷Universidade de São Paulo
- Jonatas Ferreira da Silva Santos🇧🇷Universidade de São Paulo
- Bráulio Henrique Magnani Branco🇧🇷Universidade de São Paulo
- César Cavinato Cal Abad
- Luana Farias de Oliveira🇧🇷Universidade de São Paulo
- Irineu Loturco🇧🇷Universidade de São Paulo
- Émerson Franchini🇧🇷 · autor de correspondenciaUniversidade de São Paulo
Resumen
El texto original del estudio, en el idioma en que se publicó.
Objectives
The aim of this study was to evaluate the effect of caffeine 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 caffeine (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. Lactate 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), ATP-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 (HRRτ), or by 3) analyzing the first 30-s via logarithmic regression analysis (T30).
Results
Caffeine 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, caffeine did not improve performance as measured by attack number (CAF: 26. 7 ± 1.9; PLA: 27.3 ± 2.1, P = 0.48) or attack time (CAF: 33.8 ± 1.9 s; PLA: 36.6 ± 4.5 s, P = 0.58). Similarly, RPE (CAF: 11.7 ± 0.4 a.u.; PLA: 11.5 ± 0.3 a.u., P = 0.62), HR (CAF: 170 ± 3.5 bpm; PLA: 174.2 bpm, P = 0.12), oxidative (CAF: 109.3 ± 4.5 kJ; PLA: 107.9 kJ, P = 0.61) and ATP-PCr energy contributions (CAF: 45.3 ± 3.4 kJ; PLA: 46.8 ± 3.6 kJ, P = 0.72) during the combat simulation were unaffected. Furthermore, T30 (CAF: 869.1 ± 323.2 s; PLA: 735.5 ± 232.2 s, P = 0.58), HRR60s (CAF: 34 ± 8 bpm; PLA: 38 ± 9 bpm, P = 0.44), HRRτ (CAF: 182.9 ± 40.5 s, PLA: 160.3 ± 62.2 s, P = 0.23) and HRRamp (CAF: 70.2 ± 17.4 bpm; PLA: 79.2 ± 17.4 bpm, P = 0.16) were not affected by caffeine ingestion.
Conclusions
Caffeine 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.
Resumen vía Europe PMC. Los derechos de autor siguen siendo de los autores o la editorial (CC BY).
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