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 citas
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Cómo se estudió
- Diseño
- Ensayo controlado aleatorizado (indexado por PubMed)
- Estudiado en
- Personas
- Resultado principal
- Marcadores de salud y funcionamiento
- Consumo medido con
- No se indica
Quién lo pagó
- Financiación
- Financiación no declarada
Publicación
- Publicado
- 2012-11-01 · Med Sci Sports Exerc · vol. 44 · número 11 · págs. 2213–2219
- Editorial
- Lippincott Williams & Wilkins
- Citado
- 125 citas · más que el 98% de estudios similares · 7.1× el promedio de su campo
- Impacto
- Entre el 10 % más citado de su campo
- Referencias
- 40 trabajos
- Acceso
- De pago
- Áreas de investigación
- Nitric Oxide and Endothelin Effects · Exercise and Physiological Responses · High Altitude and Hypoxia
- Palabras clave
- 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 autores
- Oliver James Peacock🇬🇧University of Bath
- Arnt Erik Tjønna🇳🇴Norwegian University of Science and Technology
- Philip E. James🇬🇧Cardiff University; Cardiff Metropolitan University
- Ulrik Wisløff🇳🇴Norwegian University of Science and Technology
- Boye Welde🇳🇴Nord University
- Nikolai Böhlke🇬🇧United Kingdom Sport
- Alan A. Smith🇬🇧United Kingdom Sport; University of Bath
- Keith Stokes🇬🇧University of Bath
- Christian John Cook🇬🇧United Kingdom Sport; University of Bath
- Øyvind B. Sandbakk🇳🇴Norwegian University of Science and Technology
Resumen
El texto original del estudio, en el idioma en que se publicó.
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.
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