Effect of repeated caffeine ingestion on repeated exhaustive exercise endurance
Bell DG, McLellan TM
Medicine and science in sports and exercise · 39 citas
Etiquetas de revisión
Financiación no declaradaDatos neutrales que nuestra revisión registró sobre cómo se hizo este estudio. Describen el método, nunca si nos gusta el resultado.
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 no declarada
Publicación
- Publicado
- 2003-08-01 · Med Sci Sports Exerc · vol. 35 · número 8 · págs. 1348–1354
- Editorial
- Lippincott Williams & Wilkins
- Citado
- 92 citas · más que el 91% de estudios similares · 3.2× el promedio de su campo
- Impacto
- Entre el 10 % más citado de su campo
- Referencias
- 27 trabajos
- Acceso
- De pago
- Áreas de investigación
- Coffee research and impacts · Sports Performance and Training · Muscle metabolism and nutrition
- Palabras clave
- caffeine, exercise endurance, time to exhaustion, repeated exercise
- MeSH
- humans, lactic acid, caffeine, blood glucose, fatty acids, nonesterified, central nervous system stimulants, pulmonary gas exchange, exercise, administration, oral, double-blind method, oxygen consumption, heart rate, physical endurance, time factors, adult, male, physical exertion
2 autores
- Doug G Bell🇨🇦Defence Research and Development Canada
- Tom M. McLellan🇨🇦Defence Research and Development Canada
Resumen
El texto original del estudio, en el idioma en que se publicó.
Purpose
The purpose of this study was to examine the effect of repeated doses of caffeine on repeated exercise endurance. METHODS Nine male caffeine users performed exercise rides (ER) to exhaustion at 80% VO(2max) after ingesting a placebo, 5 mg x kg-1 of caffeine, or 2.5 mg x kg-1 of caffeine 1 h before the ER. Two ER were performed weekly on the same day once in the morning (AM) and 5 h later in the afternoon (PM). There were four treatments containing either caffeine or placebo, i.e., trial A representing 5-mg x kg-1 caffeine in the AM and 2.5-mg x kg-1 caffeine in the PM; trial B, which was placebo in both AM and PM; trial C representing 5-mg x kg-1 caffeine in the AM and placebo in the PM; and trial D representing a placebo in the AM and 5-mg x kg-1 caffeine in the PM. The order of the treatment trials was double blind and randomized.
Results
Caffeine ingestion significantly increased exercise time to exhaustion in the AM (trial A 24.9 +/- 10.2 min and trial C 21.8 +/- 4.9 vs trial B 18.0 +/- 6.4 min and D 17.7 +/- 4.3 min). This effect was maintained in the PM and greater than placebo (B 18.3 +/- 4.8 min) regardless of whether redosing (trial A 21.5 +/- 8.6 min) or placebo (trial C 21.0 +/- 6.8) followed the initial morning dose. Caffeine dosing in the PM (trial D 22.4 +/- 7.2 min) also increased ER after placebo trial D in the AM.
Conclusions
It was concluded that redosing with caffeine after exhaustive exercise in the AM was not necessary to maintain the ergogenic effect of the drug during subsequent exercise 6 h later.
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