Effects of dietary nitrate, caffeine, and their combination on 20-km cycling time trial performance
Glaister M, Pattison JR, Muniz-Pumares D, Patterson SD, Foley P
Journal of strength and conditioning research · 52 citas
Cómo se estudió
- Diseño
- Ensayo controlado aleatorizado (indexado por PubMed)
- Estudiado en
- Personas
- Resultado principal
- Marcadores de salud y funcionamiento
Quién lo pagó
- Financiación
- Financiación independiente
- Universidad u hospital
- St Mary's University
- Universidad u hospital
- Cardiff University
Según 2 financiadores declarados.
Publicación
- Publicado
- 2014-06-25 · J Strength Cond Res · vol. 29 · número 1 · págs. 165–174
- Editorial
- Lippincott Williams & Wilkins
- Citado
- 76 citas · más que el 92% de estudios similares · 4.1× el promedio de su campo
- Impacto
- Entre el 10 % más citado de su campo
- Referencias
- 44 trabajos
- Acceso
- Acceso abierto (copia en repositorio) · CC-BY-NC
- Áreas de investigación
- Coffee research and impacts · Muscle metabolism and nutrition · Cardiovascular and exercise physiology
- Palabras clave
- Placebo, Caffeine, Time trial, Animal science, Latin square, Cycling, Medicine, Heart rate, Respiratory exchange ratio, Internal medicine, Anesthesia, Chemistry, Food science, Blood pressure, Biology
- MeSH
- humans, nitrates, caffeine, double-blind method, oxygen consumption, heart rate, physical endurance, bicycling, dietary supplements, adult, female, athletic performance, physical exertion
5 autores
- Mark Glaister🇬🇧 · autor de correspondenciaSt Mary's University Twickenham London; St Mary's University College; Cardiff Metropolitan University
- J Pattison🇬🇧St Mary's University College
- Daniel Muniz‐Pumares🇬🇧St Mary's University College
- Stephen David Patterson🇬🇧St Mary's University College
- Paul Bernard Foley🇬🇧Cardiff Metropolitan University
Resumen
El texto original del estudio, en el idioma en que se publicó.
The aim of this study was to examine the acute supplementation effects of dietary nitrate, caffeine, and their combination on 20-km cycling time trial performance. Using a randomized, counterbalanced, double-blind Latin-square design, 14 competitive female cyclists (age: 31 ± 7 years; height: 1.69 ± 0.07 m; body mass: 61.6 ± 6.0 kg) completed four 20-km time trials on a racing bicycle fitted to a turbo trainer. Approximately 2.5 hours before each trial, subjects consumed a 70-ml dose of concentrated beetroot juice containing either 0.45 g of dietary nitrate or with the nitrate content removed (placebo). One hour before each trial, subjects consumed a capsule containing either 5 mg·kg of caffeine or maltodextrin (placebo). There was a significant effect of supplementation on power output (p = 0.001), with post hoc tests revealing higher power outputs in caffeine (205 ± 21 W) vs. nitrate (194 ± 22 W) and placebo (194 ± 25 W) trials only. Caffeine-induced improvements in power output corresponded with significantly higher measures of heart rate (caffeine: 166 ± 12 b·min vs. placebo: 159 ± 15 b·min; p = 0.02), blood lactate (caffeine: 6.54 ± 2.40 mmol·L vs. placebo: 4.50 ± 2.11 mmol·L; p < 0.001), and respiratory exchange ratio (caffeine: 0.95 ± 0.04 vs. placebo: 0.91 ± 0.05; p = 0.03). There were no effects (p ≥ 0.05) of supplementation on cycling cadence, rating of perceived exertion, (Equation is included in full-text article.), or integrated electromyographic activity. The results of this study support the well-established beneficial effects of caffeine supplementation on endurance performance. In contrast, acute supplementation with dietary nitrate seems to have no effect on endurance performance and adds nothing to the benefits afforded by caffeine supplementation.
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