Neither beetroot juice supplementation nor increased carbohydrate oxidation enhance economy of prolonged exercise in elite race walkers
| Autor: | Iñigo Mujika, Nicolin Tee, Ida A. Heikura, Megan L. Ross, Peter Peeling, Brent Vallance, Georgina L. Kent, Andrew M. Jones, Jamie R. Blackwell, Karen Mackay, Rebecca Hall, Sara F. Forbes, Marta Kozior, Louise M. Burke, Avish P. Sharma, Alannah K A McKay, Jamie Whitfield |
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| Přispěvatelé: | Burke, Louise M, Hall, Rebecca, Heikura, Ida A, Ross, Megan L, Tee, Nicolin, Kent, Georgina L, Whitfield, Jamie, Forbes, Sara F, Sharma, Avish P, Jones, Andrew M, Peeling, Peter, Blackwell, Jamie R, Mujika, Iñigo, Mackay, Karen, Kozior, Marta, Vallance, Brent, McKay, Alannah K A |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Adult
Male Group investigation Increased carbohydrate Future studies Walking Beetroot Juice gut training Placebo Article exogenous CHO Oxygen Consumption Dietary Carbohydrates Humans Medicine TX341-641 Nutrition and Dietetics biology Prolonged exercise Nutrition. Foods and food supply Athletes business.industry sucralose biology.organism_classification Fruit and Vegetable Juices CHO loading Preload Economy Dietary Supplements exercise fuel Beta vulgaris business Oxidation-Reduction Food Science endurance sport |
| Zdroj: | Nutrients Volume 13 Issue 8 Nutrients, Vol 13, Iss 2767, p 2767 (2021) |
| Popis: | Given the importance of exercise economy to endurance performance, we implemented two strategies purported to reduce the oxygen cost of exercise within a 4 week training camp in 21 elite male race walkers. Fourteen athletes undertook a crossover investigation with beetroot juice (BRJ) or placebo (PLA) [2 d preload, 2 h pre-exercise + 35 min during exercise] during a 26 km race walking at speeds simulating competitive events. Separately, 19 athletes undertook a parallel group investigation of a multi-pronged strategy (MAX n = 9) involving chronic (2 w high carbohydrate [CHO] diet + gut training) and acute (CHO loading + 90 g/h CHO during exercise) strategies to promote endogenous and exogenous CHO availability, compared with strategies reflecting lower ranges of current guidelines (CON n = 10). There were no differences between BRJ and PLA trials for rates of CHO (p = 0.203) or fat (p = 0.818) oxidation or oxygen consumption (p = 0.090). Compared with CON, MAX was associated with higher rates of CHO oxidation during exercise, with increased exogenous CHO use (CON peak = ~0.45 g/min MAX: peak = ~1.45 g/min, p < 0.001). High rates of exogenous CHO use were achieved prior to gut training, without further improvement, suggesting that elite athletes already optimise intestinal CHO absorption via habitual practices. No differences in exercise economy were detected despite small differences in substrate use. Future studies should investigate the impact of these strategies on sub-elite athletes’ economy as well as the performance effects in elite groups. |
| Databáze: | OpenAIRE |
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