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No Improvement in Endurance Performance Following a Single Dose of Beetroot Juice.
MedLine Citation:
PMID:  22805107     Owner:  NLM     Status:  Publisher    
INTRODUCTION: Dietary nitrate supplementation has received much attention in the literature due to its proposed ergogenic properties. Recently, the ingestion of a single bolus of nitrate-rich beetroot juice (500 mL; ~6.2 mmol NO3-) was reported to improve subsequent time trial performance. However, this large volume of ingested beetroot juice does not represent a realistic dietary strategy for athletes to follow in a practical, performance-based setting. Therefore, we investigated the impact of ingesting a single bolus of concentrated nitrate-rich beetroot juice (140 mL; ~8.7 mmol NO3-) on subsequent 1 h time trial performance in well-trained cyclists. METHODS: Using a double-blind, repeated-measures crossover design (1 wk washout period), 20 trained male cyclists (26±1 y; O2peak=60±1 mL·kg-1·min-1; Wmax=398±7.7 W) ingested 140 mL of concentrated beetroot juice (8.7 mmol NO3-; BEET) or a placebo (nitrate-depleted beetroot juice; PLAC) with breakfast 2.5 h prior to an ~1 h cycling time trial (1073±21 kJ). Resting blood samples were collected every 30 min following BEET or PLAC ingestion and immediately post the time trial. RESULTS: Plasma nitrite concentration was higher in BEET vs PLAC prior to the onset of the time trial (532±32 vs 271±13 nM; P<0.001) but subsequent time trial performance (65.5±1.1 vs 65±1.1 s), power output (275±7 vs 278±7 W) and heart rate (170±2 vs 170±2 bpm), did not differ between BEET and PLAC treatments respectively (all P>0.05). CONCLUSION: Ingestion of a single bolus of concentrated (140 mL) beetroot juice (8.7 mmol NO3-) does not improve subsequent 1 h time trial performance in well-trained cyclists.
Naomi M Cermak; Peter Res; Rudi Stinkens; Jon O Lundberg; Martin J Gibala; J C van Loon L
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-7-4
Journal Detail:
Title:  International journal of sport nutrition and exercise metabolism     Volume:  -     ISSN:  1543-2742     ISO Abbreviation:  -     Publication Date:  2012 Jul 
Date Detail:
Created Date:  2012-7-18     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100939812     Medline TA:  Int J Sport Nutr Exerc Metab     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Department of Human Movement Sciences, NUTRIM School for Nutrition, Toxicology and Metabolism, Maastricht University Medical Centre+, Maastricht, The Netherlands.
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