Document Detail

Influence of acute dietary nitrate supplementation on 50 mile time trial performance in well-trained cyclists.
MedLine Citation:
PMID:  22526247     Owner:  NLM     Status:  Publisher    
Dietary nitrate supplementation has been reported to improve short distance time trial (TT) performance by 1-3 % in club-level cyclists. It is not known if these ergogenic effects persist in longer endurance events or if dietary nitrate supplementation can enhance performance to the same extent in better trained individuals. Eight well-trained male cyclists performed two laboratory-based 50 mile TTs: (1) 2.5 h after consuming 0.5 L of nitrate-rich beetroot juice (BR) and (2) 2.5 h after consuming 0.5 L of nitrate-depleted BR as a placebo (PL). BR significantly elevated plasma [NO(2) (-)] (BR: 472 ± 96 vs. PL: 379 ± 94 nM; P < 0.05) and reduced completion time for the 50 mile TT by 0.8 % (BR: 136.7 ± 5.6 vs. PL: 137.9 ± 6.4 min), which was not statistically significant (P > 0.05). There was a significant correlation between the increased post-beverage plasma [NO(2) (-)] with BR and the reduction in TT completion time (r = -0.83, P = 0.01). Power output (PO) was not different between the conditions at any point (P > 0.05) but oxygen uptake ([Formula: see text]O(2)) tended to be lower in BR (P = 0.06), resulting in a significantly greater PO/[Formula: see text]O(2) ratio (BR: 67.4 ± 5.5 vs. PL: 65.3 ± 4.8 W L min(-1); P < 0.05). In conclusion, acute dietary supplementation with beetroot juice did not significantly improve 50 mile TT performance in well-trained cyclists. It is possible that the better training status of the cyclists in this study might reduce the physiological and performance response to NO(3) (-) supplementation compared with the moderately trained cyclists tested in earlier studies.
Daryl P Wilkerson; Giles M Hayward; Stephen J Bailey; Anni Vanhatalo; Jamie R Blackwell; Andrew M Jones
Related Documents :
11541387 - Functional weightlessness during clinorotation of cell suspensions.
12963077 - Are pilots at risk of accidents due to fatigue?
10068617 - Maximal horizontal flight performance of hummingbirds: effects of body mass and molt.
7757147 - The value of vocal function exercises in the practice regimen of singers.
6445887 - Mixed venous co2 tension during exercise.
3194877 - Functional similarities of asbestosis and cryptogenic fibrosing alveolitis.
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-4-20
Journal Detail:
Title:  European journal of applied physiology     Volume:  -     ISSN:  1439-6327     ISO Abbreviation:  -     Publication Date:  2012 Apr 
Date Detail:
Created Date:  2012-4-24     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100954790     Medline TA:  Eur J Appl Physiol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Sport and Health Sciences, University of Exeter, St Luke's Campus, Heavitree Road, Exeter, EX1 2LU, UK,
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

Previous Document:  Large scale metal-free synthesis of graphene on sapphire and transfer-free device fabrication.
Next Document:  The magnitude and duration of post-exercise hypotension after land and water exercises.