Handzlik & Gleeson 2013 ISRN Nutrition.pdf (1.48 MB)
Likely additive ergogenic effects of combined pre-exercise dietary nitrate and caffeine ingestion in trained cyclists.
journal contributionposted on 2014-01-07, 15:36 authored by Michal K. Handzlik, Michael Gleeson
Aims. To evaluate the possible additive effects of beetroot juice plus caffeine on exercise performance. Methods. In a randomized, double-blinded study design, fourteen healthy well-trained men aged 22 ± 3 years performed four trials on different occasions following preexercise ingestion of placebo (PLA), PLA plus 5mg/kg caffeine (PLA+C), beetroot juice providing 8mmol of nitrate (BR), and beetroot juice plus caffeine (BR+C). Participants cycled at 60% maximal oxygen uptake (VO2max) for 30min followed by a time to exhaustion (TTE) trial at 80% VO2max. Saliva was collected before supplement ingestion, before exercise, and after the TTE trial for salivary nitrate, nitrite, and cortisol analysis. Results. In beetroot trials, saliva nitrate and nitrite increased >10-fold before exercise compared with preingestion (𝑃 ≤ 0.002). TTE in BR+C was 46% higher than in PLA (𝑃 = 0.096) and 18% and 27% nonsignificant TTE improvements were observed on BR+C compared with BR and PLA+C alone, respectively. Lower ratings of perceived exertion during TTE were found during 80% VO2max on BR+C compared with PLA and PLA+C (𝑃 < 0.05 for both). Conclusions. Acute preexercise beetroot juice coingestion with caffeine likely has additive effects on exercise performance compared with either beetroot or caffeine alone.
- Sport, Exercise and Health Sciences
CitationHANDZLIK, M.K. and GLEESON, M., 2013. Likely additive ergogenic effects of combined pre-exercise dietary nitrate and caffeine ingestion in trained cyclists. ISRN Nutrition, 2013, Article ID 396581
PublisherHindawi Publishing Corporation / © Michal K. Handzlik and Michael Gleeson.
- VoR (Version of Record)
NotesThis article was published in the journal ISRN Nutrition, it is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.