Dietary nitrate does not enhance running performance in elite cross-country skiers
Peacock O, Tjønna AE, James P, Wisløff U, Welde B, Böhlke N, Smith A, Stokes K, Cook C, Sandbakk O
Medicine and science in sports and exercise · 88 citations
Review labels
Neutral facts our review recorded about how this study was done. They describe method, never whether we like the result.
How it was studied
- Design
- Randomized controlled trial (indexed by PubMed)
- Studied in
- People
- Main outcome
- Health markers and function
- Intake measured by
- Not stated
Who paid for it
- Funding
- Funding not disclosed
Publication
- Published
- 2012-11-01 · Med Sci Sports Exerc · vol. 44 · issue 11 · pp. 2213–2219
- Publisher
- Lippincott Williams & Wilkins
- Cited
- 125 citations · more than 98% of similar papers · 7.1× the field average
- Impact
- Top 10% most cited in its field
- References
- 40 works
- Access
- Paywalled
- Research areas
- Nitric Oxide and Endothelin Effects · Exercise and Physiological Responses · High Altitude and Hypoxia
- Keywords
- Placebo, Nitrate, Dietary Nitrate, Time trial, Ingestion, VO2 max, Nitrite, Animal science, Medicine, Treadmill, Physical therapy, Internal medicine, Chemistry, Blood pressure, Heart rate, Biology
- MeSH
- humans, nitrates, nitrites, potassium compounds, double-blind method, oxygen consumption, running, skiing, dietary supplements, adolescent, norway, male, athletic performance
10 authors
From GB, NO
- Oliver James PeacockUniversity of Bath
- Arnt Erik TjønnaNorwegian University of Science and Technology
- Philip E. JamesCardiff University; Cardiff Metropolitan University
- Ulrik WisløffNorwegian University of Science and Technology
- Boye WeldeNord University
- Nikolai BöhlkeUnited Kingdom Sport
Abstract
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˙O(2max)) ≈ 70 mL·kg·min) 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 (≈55% of V˙O(2max)) and 14 km·h (≈75% of V˙O(2max)), 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·h (both 2.84 ± 0.34 L·min) and 14 km·h (3.89 ± 0.39 vs. 3.77 ± 0.62 L·min).
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.
Abstract via Europe PMC. Copyright remains with the authors or publisher.
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