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dc.contributor.authorLane, Stephen C
dc.contributor.authorHawley, John A
dc.contributor.authorDesbrow, Ben
dc.contributor.authorJones, Andrew M
dc.contributor.authorBlackwell, James R
dc.contributor.authorRoss, Megan L
dc.contributor.authorZemski, Adam J
dc.contributor.authorBurke, Louise M
dc.date.accessioned2017-05-03T13:25:26Z
dc.date.available2017-05-03T13:25:26Z
dc.date.issued2014
dc.identifier.issn1715-5312
dc.identifier.doi10.1139/apnm-2013-0336
dc.identifier.urihttp://hdl.handle.net/10072/64024
dc.description.abstractBoth caffeine and beetroot juice have ergogenic effects on endurance cycling performance. We investigated whether there is an additive effect of these supplements on the performance of a cycling time trial (TT) simulating the 2012 London Olympic Games course. Twelve male and 12 female competitive cyclists each completed 4 experimental trials in a double-blind Latin square design. Trials were undertaken with a caffeinated gum (CAFF) (3 mg·kg−1 body mass (BM), 40 min prior to the TT), concentrated beetroot juice supplementation (BJ) (8.4 mmol of nitrate (NO3–), 2 h prior to the TT), caffeine plus beetroot juice (CAFF+BJ), or a control (CONT). Subjects completed the TT (females: 29.35 km; males: 43.83 km) on a laboratory cycle ergometer under conditions of best practice nutrition: following a carbohydrate-rich pre-event meal, with the ingestion of a carbohydrate–electrolyte drink and regular oral carbohydrate contact during the TT. Compared with CONT, power output was significantly enhanced after CAFF+BJ and CAFF (3.0% and 3.9%, respectively, p < 0.01). There was no effect of BJ supplementation when used alone (–0.4%, p = 0.6 compared with CONT) or when combined with caffeine (–0.9%, p = 0.4 compared with CAFF). We conclude that caffeine (3 mg·kg−1 BM) administered in the form of a caffeinated gum increased cycling TT performance lasting ∼50–60 min by ∼3%–4% in both males and females. Beetroot juice supplementation was not ergogenic under the conditions of this study.
dc.description.peerreviewedYes
dc.description.publicationstatusYes
dc.format.extent362655 bytes
dc.format.mimetypeapplication/pdf
dc.languageEnglish
dc.language.isoeng
dc.publisherN R C Research Press
dc.publisher.placeCanada
dc.relation.ispartofstudentpublicationY
dc.relation.ispartofpagefrom1050
dc.relation.ispartofpageto1057
dc.relation.ispartofissue9
dc.relation.ispartofjournalApplied Physiology, Nutrition and Metabolism
dc.relation.ispartofvolume39
dc.rights.retentionY
dc.subject.fieldofresearchBiological sciences
dc.subject.fieldofresearchBiomedical and clinical sciences
dc.subject.fieldofresearchcode31
dc.subject.fieldofresearchcode32
dc.titleSingle and combined effects of beetroot juice and caffeine supplementation on cycling time trial performance
dc.typeJournal article
dc.type.descriptionC1 - Articles
dc.type.codeC - Journal Articles
gro.rights.copyright© 2014 NRC Research Press. The attached file is reproduced here in accordance with the copyright policy of the publisher. Please refer to the journal's website for access to the definitive, published version.
gro.hasfulltextFull Text
gro.griffith.authorDesbrow, Ben


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