Effects of two different doses of carbohydrate ingestion on taekwondo-related performance during a simulated tournament.

Autor: Naderi A; Department of Sport Physiology, Boroujerd Branch, Islamic Azad University, Boroujerd, Iran. Naderi_a@yahoo.com., Samanipour MH; Department of Sport Science, Imam Khomeini International University, Qazvin, Iran., Sarshin A; Department of Exercise Physiology, Karaj Branch, Islamic Azad University, Karaj, Iran., Forbes SC; Faculty of Education, Department of Physical Education Studies, Brandon University, Brandon, MB, R7A6A9, Canada., Koozehchian MS; Department of Kinesiology, Jacksonville State University, Jacksonville, AL, 36265, USA., Franchini E; School of Physical Education and Sport, University of São Paulo (USP), São Paulo, Brazil., Reale R; UFC Performance Institute, Shanghai, China., Berjisian E; Department of Exercise Physiology, Faculty of Physical Education and Sport Sciences, Tehran, Iran., de Oliveira EP; Laboratory of Nutrition, Exercise and Health (LaNES), School of Medicine, Federal University of Uberlandia (UFU), Uberlandia, Minas Gerais, Brazil., Miraftabi H; Department of Exercise Physiology, Faculty of Physical Education and Sport Sciences, Tehran, Iran., Sharafshadeh MS; Ebne Sina Sports Medicine Group, Elmi-Karbordi University, Tehran, Iran., Rezaei S; College of Health and Human Sciences, Charles Darwin University, Darwin, Australia.
Jazyk: angličtina
Zdroj: Journal of the International Society of Sports Nutrition [J Int Soc Sports Nutr] 2021 May 27; Vol. 18 (1), pp. 40. Date of Electronic Publication: 2021 May 27.
DOI: 10.1186/s12970-021-00434-4
Abstrakt: Background: Carbohydrate (CHO) ingestion enhances exercise performance; however, the efficacy of CHO intake on repeated bouts of exercise simulating a taekwondo tournament is unknown. Therefore, the purpose was to compare the effects of two different doses of CHO on a sports-specific kicking test during a simulated taekwondo tournament compared to placebo (PLA).
Methods: In a double-blind, randomized-placebo controlled, cross-over trial, eleven junior male professional taekwondo athletes (age: 16 ± 0.8 years, body mass: 55.3 ± 7.3 kg) ingested one of three solutions: (i) high dose (C45): 45 g of CHO (60 g∙h - 1 ), (ii) low dose (C22.5): 22.5 g of CHO (30 g∙h - 1 ; both solutions containing 2:1 glucose:fructose), or a PLA immediately following each kicking test. The kicking test was repeated 5 times, separated by 45 mins of rest, simulating a typical taekwondo competition day. Ratings of perceived exertion (RPE) and gastrointestinal discomfort (GI) scores were collected immediately after, and blood glucose before each test.
Results: The results revealed that C45 and C22.5 did not improve total, successful, or percentage of successful kicks compared to PLA (p > 0.05). Blood glucose was significantly higher following both CHO conditions compared with PLA across all five tests (p < 0.05). There were no differences between treatments or across tests for RPE (p > 0.05).
Conclusion: CHO intake, independent of the dose, did not alter taekwondo kick performance during a simulated taekwondo tournament.
Databáze: MEDLINE
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