标题：Efecto agudo de la ingestión de cafeína sobre el tiempo de reacción y la actividad electromiográfica de la patada circular Dollyo Chagi en taekwondistas. [Acute effect of caffeine ingestion on reaction time and electromyographic activity of the Dollyo Chagi round kick in taekwondo fighters].
期刊名称：RICYDE. Revista Internacional de Ciencias del Deporte. doi:10.5232/ricyde
印刷版ISSN：1885-3137
出版年度：2017
卷号：13
期号：47
页码：52-62
语种：Spanish
出版社：Ramón Cantó Alcaraz (Publisher)
摘要：La cafeína es una de las sustancias ergogénicas más consumidas en el deporte, debido a sus propiedades estimulantes sobre el sistema nervioso central mejorando el rendimiento deportivo y disminuyendo la fatiga muscular. Objetivo: Investigar el efecto agudo de la cafeína sobre el tiempo de reacción y actividad muscular del músculo cuádriceps en una patada circular Dollyo Chagi en taekwondistas. Métodos: 13 taekwondistas ingirieron 5 mg·kg -1 de cafeína o placebo. El tiempo de reacción y la actividad muscular se midieron 60 min previo a la ingesta de cafeína o placebo, 60 min después de la ingesta y posterior a un estímulo fatigante. Se utilizó electromiografía (EMG) de superficie para medir la amplitud de la señal EMG y el tiempo de reacción en el musculo recto femoral, vasto lateral, vasto medial y bíceps femoral durante la ejecución de una patada circular asociada a un estímulo sonoro. Resultados: La ingesta de cafeína redujo un 29% el tiempo de reacción en el musculo recto femoral 60 min después de la ingesta (P<0,05) y tan solo un 5.5% después del estímulo fatigante (P>0,05). No se encontró disminución del tiempo de reacción en otros músculos evaluados. No se observaron cambios en la amplitud EMG en ninguna de las condiciones. Conclusión: La suplementación con cafeína mejoraría el tiempo de reacción de una patada circular Dollyo Chagi antes y después de un estímulo fatigante en taekwondistas. Abstract Caffeine is considered an enhancing aid and most consumed in sports, mainly due to its stimulant properties on the central nervous system, improving athletic performance and decreasing muscle fatigue. Objective: The aim of this study was to investigate the acute effect of caffeine on the reaction time and muscle activity of a Dollyo Chagi kick in taekwondo fighters. Methods: Thirteen taekwondo fighters ingested either 5 mg of caffeine per kg of body mass or a placebo. Reaction time and muscle activity were measured 60 min before the intake of caffeine or placebo, 60 min after ingestion and after a fatigue stimuli. Surface electromyogram (sEMG) amplitude, and time of reaction of the muscles rectus femoris, vastus lateralis, vastus medialis and biceps femoris during a circular kick related to a sound stimulus were measured. Results: Caffeine ingestion decreased the reaction time of the rectus femoris muscle 60-minutes after ingestion of caffeine and after strenuous stimulation (P<0.05). No significant decrease in reaction time was observed in other muscles. Furthermore, no changes in muscles activity in any other muscles were found. 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关键词：deporte de contacto;activación muscular;fatiga;suplementación;ayuda ergogénica;combat sports;muscle activity;fatigue;ergogenic aid;supplementation.
