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No individual or combined effects of caffeine and beetroot-juice supplementation during submaximal or maximal running
Mid Sweden University, Faculty of Human Sciences, Department of Health Sciences. (Swedish Winter Sports Research Centre)
Mid Sweden University, Faculty of Human Sciences, Department of Health Sciences. (Swedish Winter Sports Research Centre)ORCID iD: 0000-0002-1273-6061
2018 (English)In: Applied Physiology, Nutrition and Metabolism, ISSN 1715-5312, E-ISSN 1715-5320Article in journal (Refereed) Epub ahead of print
Abstract [en]

Background: Dietary supplements such as caffeine and beetroot juice are used byathletes in an attempt to optimize performance and therefore gain an advantagein competition. Aim: To investigatethe individual and combined effects of caffeine and beetroot-juicesupplementation during submaximal and maximal treadmill running. Methods: Seven males (VO2max:59.0 ± 2.9 mL/kg/min) and two females (VO2max: 53.1 ± 11.4 mL/kg/min)performed a preliminary trial followed by four experimental test sessions,which consisted of two, 5-min submaximal running bouts (at ~ 70% and 80% of VO2max) and a maximal 1-km time-trial (TT) in a laboratory. Participants ingested a 70-ml dose of concentrated beetroot juice containing either 7.3 mmol of nitrate (BR) or no nitrate (PBR) 2.5 hours prior to each test session, theneither 4.8 ± 0.4 (4.3–5.6) mg/kg caffeine (C) or a caffeine placebo (PC)45 minutes before each test session. The four test sessions (BR-C, BR-PC,PBR-C and PBR-PC) were presented in a counter-balancedand double-blind manner. Results: Nosignificant differences were identified between the four interventionsregarding relative VO2, running economy, RER, heart rate (HR) or RPEat the two submaximal intensities (P > 0.05). Moreover, there were nosignificant differences in performance, maximum HR, peak blood lactateconcentration or RPE during the maximal TT when comparing the interventions (P> 0.05). Conclusion: No beneficialeffects of supplementing with typical doses of caffeine, beetroot juice or acombination of the two were observed for physiological, perceptual orperformance responses during submaximal or maximal treadmill running exercise.

Place, publisher, year, edition, pages
2018.
Keyword [en]
ergogenic aids, nitrate, performance, time-trial, work economy
National Category
Sport and Fitness Sciences
Identifiers
URN: urn:nbn:se:miun:diva-33511DOI: 10.1139/apnm-2017-0547OAI: oai:DiVA.org:miun-33511DiVA, id: diva2:1199105
Available from: 2018-04-19 Created: 2018-04-19 Last updated: 2018-04-20Bibliographically approved

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Oskarsson, JohannaMcGawley, Kerry

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