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Dietary Nitrate Does Not Enhance Running Performance in Elite Cross-country Skiers.
MedLine Citation:
PMID:  22874535     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
PURPOSE: To examine the effects of acute ingestion of dietary nitrate on endurance running performance in highly-trained cross-country skiers. Dietary nitrate has been shown to reduce the oxygen cost of submaximal exercise and improve tolerance of high intensity exercise, but it is not known if this holds true for highly-trained endurance athletes. METHODS: Ten male junior cross-country skiers (VO2max ≈70 mL·kg·min) each completed two trials in a randomised, double-blind design. Participants ingested potassium nitrate (614 mg nitrate) or a nitrate-free placebo 2.5 h before two 5-min submaximal tests on a treadmill at 10 km·h (≈55% of VO2max) and 14 km·h (≈75% of VO2max), followed by a 5-km running time-trial on an indoor track. RESULTS: Plasma nitrite concentrations were higher after nitrate supplementation (325 ± 95 nmol·L) compared with placebo (143 ± 59 nmol·L, p<0.001). There was no significant difference in 5-km time-trial performance between nitrate (1005 ± 53 s) and placebo treatments (996 ± 49 s, p=0.12). The oxygen cost of submaximal running was not significantly different between placebo and nitrate trials at 10 km[BULLET OPERATOR]h (both 2.84 ± 0.34 L[BULLET OPERATOR]min ) and 14 km[BULLET OPERATOR]h (3.89 ± 0.39 L[BULLET OPERATOR]min Vs. 3.77 ± 0.62 L[BULLET OPERATOR]min ). CONCLUSION: Acute ingestion of dietary nitrate may not represent an effective strategy for reducing the oxygen cost of submaximal exercise or for enhancing endurance exercise performance in highly-trained cross-country skiers.
Authors:
Oliver Peacock; Arnt Erik Tjonna; Philip James; Ulrik Wisloff; Boye Welde; Nikolai Bohlke; Alan Smith; Keith Stokes; Christian Cook; Oyvind Sandbakk
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-8-7
Journal Detail:
Title:  Medicine and science in sports and exercise     Volume:  -     ISSN:  1530-0315     ISO Abbreviation:  Med Sci Sports Exerc     Publication Date:  2012 Aug 
Date Detail:
Created Date:  2012-8-9     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:
1Sport, Health and Exercise Science Research Group, Department for Health, University of Bath, United Kingdom 2K.G.Jebsen - Centre of Exercise in Medicine, Department of Circulation and Medical Imaging, Norwegian University of Science and Technology, Trondheim, Norway 3Wales Heart Research Institute, Department of Cardiology, Cardiff University, Cardiff, United Kingdom 4Department of Sport and Physical Education, Nord-Trøndelag University College, Levanger, Norway 5UK Sport Council, 40 Bernard Street, London, United Kingdom 6Department of Human Movement Science, Norwegian University of Science and Technology, Trondheim, Norway.
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