dc.contributor.author | Davenport, AD | |
dc.contributor.author | Jameson, TSO | |
dc.contributor.author | Kilroe, SP | |
dc.contributor.author | Monteyne, AJ | |
dc.contributor.author | Pavis, GF | |
dc.contributor.author | Wall, BT | |
dc.contributor.author | Dirks, ML | |
dc.contributor.author | Alamdari, N | |
dc.contributor.author | Mikus, CR | |
dc.contributor.author | Stephens, FB | |
dc.date.accessioned | 2020-04-16T08:00:42Z | |
dc.date.issued | 2020-03-30 | |
dc.description.abstract | BACKGROUND: Pre-exercise supplements containing low doses of caffeine improve endurance exercise performance, but the most efficacious time for consumption before intense endurance exercise remains unclear, as does the contribution of caffeine metabolism. METHODS: This study assessed the timing of a commercially available supplement containing 200 mg of caffeine, 1600 mg of β-alanine and 1000 mg of quercetin [Beachbody Performance Energize, Beachbody LLC, USA] on exercise performance, perception of effort and plasma caffeine metabolites. Thirteen cyclists (V̇O2max 64.5 ± 1.4 ml kg- 1 min- 1 (± SEM)) completed four experimental visits consisting of 30 min of steady-state exercise on a cycle ergometer at 83 ± 1% V̇O2max followed by a 15-min time trial, with perceived exertion measured regularly. On three of the visits, participants consumed caffeine either 35 min before steady-state exercise (PRE), at the onset of steady-state (ONS) or immediately before the time trial (DUR) phases, with a placebo consumed at the other two time points (i.e. three drinks per visit). The other visit (PLA) consisted of consuming the placebo supplement at all three time points. The placebo was taste-, colour- and calorie-matched. RESULTS: Total work performed during the time trial in PRE was 5% greater than PLA (3.53 ± 0.14 vs. 3.36 ± 0.13 kJ kg- 1 body mass; P = 0.0025), but not ONS (3.44 ± 0.13 kJ kg- 1; P = 0.3619) or DUR (3.39 ± 0.13 kJ kg- 1; P = 0.925), which were similar to PLA. Perceived exertion was lowest during steady-state exercise in the PRE condition (P < 0.05), which coincided with elevated plasma paraxanthine in PRE only (P < 0.05). CONCLUSION: In summary, ingestion of a pre-exercise supplement containing 200 mg caffeine 35 min before exercise appeared optimal for improved performance in a subsequent fatiguing time trial, possibly by reducing the perception of effort. Whether this was due to increased circulating paraxanthine requires further investigation. TRIAL REGISTRATION: ClinicalTrials.Gov, NCT02985606 ; 10/26/2016. | en_GB |
dc.description.sponsorship | Beachbody | en_GB |
dc.identifier.citation | Vol. 6, pp. 17 | en_GB |
dc.identifier.doi | 10.1186/s40798-020-00246-x | |
dc.identifier.other | 10.1186/s40798-020-00246-x | |
dc.identifier.uri | http://hdl.handle.net/10871/120657 | |
dc.language.iso | en | en_GB |
dc.publisher | Springer | en_GB |
dc.relation.url | https://www.ncbi.nlm.nih.gov/pubmed/32232597 | en_GB |
dc.rights.embargoreason | © The Author(s). 2020 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. | en_GB |
dc.subject | Ergogenic aid | en_GB |
dc.subject | Metabolism | en_GB |
dc.subject | Paraxanthine | en_GB |
dc.subject | Perceived exertion | en_GB |
dc.subject | Performance | en_GB |
dc.subject | Sports nutrition | en_GB |
dc.title | A Randomised, Placebo-Controlled, Crossover Study Investigating the Optimal Timing of a Caffeine-Containing Supplement for Exercise Performance. | en_GB |
dc.type | Article | en_GB |
dc.date.available | 2020-04-16T08:00:42Z | |
dc.identifier.issn | 2199-1170 | |
exeter.place-of-publication | Switzerland | en_GB |
dc.description | This is the final version. Available from Springer via the DOI in this record. | en_GB |
dc.description | The datasets used and/or analysed during the current study are available from the corresponding author on reasonable request. | en_GB |
dc.identifier.journal | Sports Medicine - Open | en_GB |
dc.rights.uri | http://creativecommons.org/licenses/by/4.0/ | en_GB |
dcterms.dateAccepted | 2020-03-19 | |
exeter.funder | ::Beachbody | en_GB |
rioxxterms.version | VoR | en_GB |
rioxxterms.licenseref.startdate | 2020-03-19 | |
rioxxterms.type | Journal Article/Review | en_GB |
refterms.dateFCD | 2020-04-16T07:57:42Z | |
refterms.versionFCD | VoR | |
refterms.dateFOA | 2020-04-16T08:00:46Z | |
refterms.panel | C | en_GB |