Journal
MEDICINE AND SCIENCE IN SPORTS AND EXERCISE
Volume 44, Issue 11, Pages 2213-2219Publisher
LIPPINCOTT WILLIAMS & WILKINS
DOI: 10.1249/MSS.0b013e3182640f48
Keywords
ERGOGENIC AID; NITRATE SUPPLEMENTATION; NITRIC OXIDE METABOLITES; OXYGEN UPTAKE
Categories
Funding
- K.G. Jebsen Foundation
- Norwegian Council on Cardiovascular Disease
- Norwegian Research Council
- UK Sport Council
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PEACOCK, O., A. E. TJONNA, P. JAMES, U. WISLOFF, B. WELDE, N. BOHLKE, A. SMITH, K. STOKES, C. COOK, and O. SANDBAKK. Dietary Nitrate Does Not Enhance Running Performance in Elite Cross-Country Skiers. Med. Sci. Sports Exerc., Vol. 44, No. 11, pp. 2213-2219, 2012. Purpose: The objective of this study is 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 (V (over dot)O-2max approximate to 70 mL.kg(-1).min(-1)) each completed two trials in a randomized, 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(-1) (approximate to 55% of V (over dot)O-2max and 14 kmh(-1) (approximate to 75% of V (over dot)O-2max), followed by a 5-km running time trial on an indoor track. Results: Plasma nitrite concentrations were higher afler nitrate supplementation (325 +/- 95 nmol.L-1) compared with placebo (143 +/- 59 nmol.L-1, 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.h(-1) (both 2.84 +/- 0.34 L.min(-1)) and 14 km.h(-1) (3.89 +/- 0.39 vs. 3.77 +/- 0.62 L.min(-1)). Conclusions: 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.
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