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Acute Dietary Nitrate Supplementation Improves Cycling Time Trial Performance.
MedLine Citation:
PMID:  21471821     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
PURPOSE:: Dietary nitrate supplementation has been shown to reduce the O2 cost of sub-maximal exercise and to improve high-intensity exercise tolerance. However, it is presently unknown whether it may enhance performance during simulated competition. The present study investigated the effects of acute dietary nitrate supplementation on power output (PO), V˙o2, and performance during 4 km and 16.1 km cycling time trials (TT). METHODS:: Following familiarization, nine club-level competitive male cyclists were assigned in a randomized, cross-over design to consume 0.5 L of beetroot juice (BR; containing ~6.2 mmol of nitrate) or 0.5 L of nitrate-depleted beetroot juice (placebo, PL; containing ~0.0047 mmol of nitrate), ~2.5 h prior to the completion of a 4 km and a 16.1 km TT. RESULTS:: BR supplementation elevated plasma [nitrite] (PL: 241 ± 125 vs. BR: 575 ± 199 nM; P<0.05). The V˙o2 values during the TTs were not significantly different between the BR and PL conditions at any elapsed distance (P>0.05) but BR significantly increased mean PO during the 4 km (PL: 279 ± 51 vs. BR: 292 ± 44 W; P<0.05) and 16.1 km TT (PL: 233 ± 43 vs. BR: 247 ± 44 W; P<0.01). Consequently, BR improved 4 km performance by 2.8% (PL: 6.45 ± 0.42 vs. BR: 6.27 ± 0.35 min; P<0.05) and 16.1 km performance by 2.7% (PL: 27.7 ± 2.1 vs. BR: 26.9 ± 1.8 min; P<0.01). CONCLUSION:: These results suggest that acute dietary nitrate supplementation with 0.5 L BR improves cycling economy, as demonstrated by a higher PO for the same V˙o2, and enhances both 4 km and 16.1 km cycling TT performance.
Authors:
Katherine E Lansley; Paul G Winyard; Stephen J Bailey; Anni Vanhatalo; Daryl P Wilkerson; Jamie R Blackwell; Mark Gilchrist; Nigel Benjamin; Andrew M Jones
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-4-5
Journal Detail:
Title:  Medicine and science in sports and exercise     Volume:  -     ISSN:  1530-0315     ISO Abbreviation:  -     Publication Date:  2011 Apr 
Date Detail:
Created Date:  2011-4-7     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8005433     Medline TA:  Med Sci Sports Exerc     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
1 Sport and Health Sciences, College of Life and Environmental Sciences, and 2 Peninsula College of Medicine and Dentistry, St. Luke's Campus, University of Exeter, Heavitree Road, Exeter, EX1 2LU, UK.
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