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Neither beetroot juice supplementation nor increased carbohydrate oxidation enhance economy of prolonged exercise in elite race walkers

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Show simple item record 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. 2021-08-18T11:38:08Z 2021-08-18T11:38:08Z 2021
dc.description peer-reviewed en_US
dc.description.abstract 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. en_US
dc.language.iso eng en_US
dc.publisher MDPI en_US
dc.relation.ispartofseries Nutrients;13, 2767
dc.subject exercise fuel en_US
dc.subject gut training en_US
dc.subject exogenous CHO en_US
dc.title Neither beetroot juice supplementation nor increased carbohydrate oxidation enhance economy of prolonged exercise in elite race walkers en_US
dc.type info:eu-repo/semantics/article en_US
dc.type.supercollection all_ul_research en_US
dc.type.supercollection ul_published_reviewed en_US
dc.identifier.doi 10.3390/nu13082767
dc.contributor.sponsor ACURF en_US
dc.contributor.sponsor Association of Potato Research and Education en_US
dc.relation.projectid 2017000034 en_US
dc.rights.accessrights info:eu-repo/semantics/openAccess en_US

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