No improvement of repeated-sprint performance with dietary nitrate
Martin K, Smee D, Thompson KG, Rattray B
International journal of sports physiology and performance · 36 citas
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Cómo se estudió
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- Ensayo controlado aleatorizado (indexado por PubMed)
- Estudiado en
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- Resultado principal
- Marcadores de salud y funcionamiento
- Consumo medido con
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Quién lo pagó
- Financiación
- Financiación no declarada
Publicación
- Publicado
- 2014-01-15 · Int J Sports Physiol Perform · vol. 9 · número 5 · págs. 845–850
- Editorial
- Human Kinetics
- Citado
- 58 citas · más que el 93% de estudios similares · 4.0× el promedio de su campo
- Impacto
- Entre el 10 % más citado de su campo
- Referencias
- 28 trabajos
- Acceso
- De pago
- Áreas de investigación
- Exercise and Physiological Responses · Nitric Oxide and Endothelin Effects · Muscle metabolism and nutrition
- Palabras clave
- Sprint, Crossover study, Animal science, Dietary Nitrate, Placebo, Repeated measures design, Nitrate, VO2 max, Cycle ergometer, Time trial, Medicine, Physical therapy, Chemistry, Internal medicine, Mathematics, Heart rate, Blood pressure, Biology, Nitrite, Statistics
- MeSH
- muscle, skeletal, humans, nitrates, lactic acid, treatment outcome, cross-over studies, double-blind method, perception, recovery of function, oxygen consumption, heart rate, muscle fatigue, time factors, bicycling, dietary supplements, adult, australian capital territory, female, male, muscle strength, athletic performance, young adult, performance-enhancing substances, biomarkers
4 autores
- Kristy Martin🇦🇺University of Canberra
- Disa J. Smee🇷🇸Center for Health, Exercise and Sport Sciences
- Kevin Thompson
- Ben Rattray🇷🇸Center for Health, Exercise and Sport Sciences
Resumen
El texto original del estudio, en el idioma en que se publicó.
Purpose
Nitrate supplementation improves endurance exercise and single bouts of high-intensity activity, but its effect on repeated sprints is unclear. This study is the first to investigate the effects of acute dietary nitrate supplementation during a high-intensity intermittent-sprint test to exhaustion.
Methods
Team-sport athletes (9 male, age 22.3 ± 2.1 y, VO2max 57.4 ± 8.5 mL · kg-1 · min-1; 7 female, age 20.7 ± 1.3 y, VO2max 47.2 ± 8.5 mL · kg-1 · min-1) were assigned to a double-blind, randomized, crossover design. Participants consumed 70 mL of concentrated beetroot juice containing a minimum of 0.3 g of nitrate (NT) or 70 mL of placebo (PL) 2 h before a repeated-sprint protocol involving repeated 8-s sprints with 30-s recovery on a cycle ergometer to exhaustion.
Results
Fewer sprints (NT = 13 ± 5 vs PL = 15 ± 6, P = .005, d = 0.41) and less total work (NT = 49.2 ± 24.2 kJ vs PL = 57.8 ± 34.0 kJ, P = .027, d = 0.3) were completed in NT relative to PL. However there was no difference in overall mean power output or the mean power output for each individual 8-s sprint.
Conclusions
These findings suggest that dietary nitrate is not beneficial for improving repeated-sprint performance, at least when such sprints are near-maximal and frequent in nature. The lack of an effect of nitrate at near-maximal oxygen uptake supports the suggestion that at greater exercise intensities nitrate does not have an ergogenic effect.
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