Induced alkalosis and caffeine supplementation: effects on 2,000-m rowing performance
Carr AJ, Gore CJ, Dawson B
International journal of sport nutrition and exercise metabolism · 42 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
- Gobierno
- Australian Institute of Sport
Según 1 financiador declarado.
Publicación
- Publicado
- 2011-10-01 · Int J Sport Nutr Exerc Metab · vol. 21 · número 5 · págs. 357–364
- Editorial
- Human Kinetics
- Citado
- 71 citas · más que el 89% de estudios similares · 2.7× el promedio de su campo
- Referencias
- 41 trabajos
- Acceso
- De pago
- Áreas de investigación
- Coffee research and impacts · Sports Performance and Training · Muscle metabolism and nutrition
- Palabras clave
- caffeine supplementation, sodium bicarbonate, rowing performance, blood bicarbonate, blood lactate, gastrointestinal symptoms, rating of perceived exertion, ergogenic aids
- MeSH
- humans, alkalosis, sodium bicarbonate, caffeine, central nervous system stimulants, cross-over studies, double-blind method, hydrogen-ion concentration, sports, ships, dietary supplements, female, male, athletic performance, physical exertion
3 autores
- Amelia J. Carr🇦🇺The University of Western Australia
- Christopher J. Gore
- BRIAN T. DAWSON
Resumen
El texto original del estudio, en el idioma en que se publicó.
Introduction
The purpose of this investigation was to determine the effect of ingested caffeine, sodium bicarbonate, and their combination on 2,000-m rowing performance, as well as on induced alkalosis (blood and urine pH and blood bicarbonate concentration [HCO3-]), blood lactate concentration ([La-]), gastrointestinal symptoms, and rating of perceived exertion (RPE).
Methods
In a double-blind, crossover study, 8 well-trained rowers performed 2 baseline tests and 4 × 2,000-m rowing-ergometer tests after ingesting 6 mg/kg caffeine, 0.3 g/kg body mass (BM) sodium bicarbonate, both supplements combined, or a placebo. Capillary blood samples were collected at preingestion, pretest, and posttest time points. Pairwise comparisons were made between protocols, and differences were interpreted in relation to the likelihood of exceeding the smallest worthwhile-change thresholds for each variable. A likelihood of >75% was considered a substantial change.
Results
Caffeine supplementation elicited a substantial improvement in 2,000-m mean power, with mean (± SD) values of 354 ± 67 W vs. placebo with 346 ± 61 W. Pretest [HCO3-] reached 29.2 ± 2.9 mmol/L with caffeine + bicarbonate and 29.1 ± 1.9 mmol/L with bicarbonate. There were substantial increases in pretest [HCO3-] and pH and posttest urine pH after bicarbonate and caffeine + bicarbonate supplementation compared with placebo, but unclear performance effects.
Conclusions
Rowers' performance in 2,000-m efforts can improve by ~2% with 6 mg/kg BM caffeine supplementation. When caffeine is combined with sodium bicarbonate, gastrointestinal symptoms may prevent performance enhancement, so further investigation of ingestion protocols that minimize side effects is required.
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