The Effect of Dietary Nitrate Supplementation on Physiology and Performance in Trained Cyclists
McQuillan JA, Dulson DK, Laursen PB, Kilding AE
International journal of sports physiology and performance · 12 citas
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 independiente
- Universidad u hospital
- Johns Hopkins University
Según 1 financiador declarado.
Publicación
- Publicado
- 2016-10-13 · Int J Sports Physiol Perform · vol. 12 · número 5 · págs. 684–689
- Editorial
- Human Kinetics
- Citado
- 19 citas · más que el 92% de estudios similares · 3.3× el promedio de su campo
- Impacto
- Entre el 10 % más citado de su campo
- Referencias
- 28 trabajos
- Acceso
- Lectura gratuita
- Áreas de investigación
- Cardiovascular and exercise physiology · Muscle metabolism and nutrition · Pharmacological Effects and Assays
- Palabras clave
- Time trial, Placebo, Crossover study, Medicine, Confidence interval, Cycling, Animal science, Endurance training, VO2 max, Physical therapy, Internal medicine, Heart rate, Blood pressure, Biology
- MeSH
- humans, nitrates, cross-over studies, double-blind method, energy metabolism, oxygen consumption, anaerobic threshold, bicycling, dietary supplements, adult, male, athletic performance, physical conditioning, human, fruit and vegetable juices
4 autores
- Joseph A. McQuillan🇳🇿 · autor de correspondenciaAuckland University of Technology; University of Waikato
- Deborah K. Dulson🇳🇿Auckland University of Technology
- Paul B. Laursen
- Andrew Edward Kilding🇳🇿Auckland University of Technology
Resumen
El texto original del estudio, en el idioma en que se publicó.
Purpose
To determine the effect of dietary nitrate (NO3-) supplementation on physiology and performance in well-trained cyclists after 6-8 d of NO3- supplementation.
Methods
Eight competitive male cyclists (mean ± SD age 26 ± 8 y, body mass 76.7 ± 6.9 kg, VO2peak 63 ± 4 mL · kg-1 · min-1) participated in a double-blind, placebo-controlled, crossover-design study in which participants ingested 70 mL of beetroot juice containing ~4 mmol NO3- (NIT) or a NO3--depleted placebo (PLA), each for 8 d. Replicating pretreatment measures, participants undertook an incremental ramp assessment to determine VO2peak and first (VT1) and second (VT2) ventilatory thresholds on d 6 (NIT6 and PLA6), moderate-intensity cycling economy on d 7 (NIT7 and PLA7), and a 4-km time trial (TT) on d 8 (NIT8 and PLA8).
Results
Relative to PLA, 6 d of NIT supplementation produced unclear effects for VO2peak (mean ± 95% confidence limit: 1.8% ± 5.5%) and VT1 (3.7% ± 12.3%) and trivial effects for both VT2 (-1.0% ± 3.0%) and exercise economy on d 7 (-1.0% ± 1.6%). However, effects for TT performance time (-0.7% ± 0.9%) and power (2.4% ± 2.5%) on d 8 were likely beneficial.
Conclusions
Despite mostly unclear outcomes for standard physiological determinants of performance, 8 d of NO3- supplementation resulted in likely beneficial improvements to 4-km TT performance in well-trained male endurance cyclists.
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