Effects of two different doses of carbohydrate ingestion on taekwondo-related performance during a simulated tournament. Issue 1 (27th May 2021)

• Record Type: Journal Article
• Authors: Naderi, Alireza; Samanipour, Mohammad Hossein; Sarshin, Amir; Forbes, Scott C.; Koozehchian, Majid S.; Franchini, Emerson; Reale, Reid; Berjisian, Erfan; de Oliveira, Erick P.; Miraftabi, Hossein; Sharafshadeh, Maryam Safari; Rezaei, Sajjad
• Is Part Of: Journal of the International Society of Sports Nutrition. Volume 18:Issue 1(2021)
• Publication Date: 2021-05-27
• Subjects: High-intensity intermittent Exercice -- Rating of perceived exertion -- Blood glucose -- Combat sports; Athletes -- Nutrition -- Periodicals; Exercise -- Physiological aspects -- Periodicals; 613.2024796
• DOI: 10.1186/s12970-021-00434-4
• Languages: English
• ISSNs: 1550-2783

Abstract

Abstract: 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.