Effects of caffeine ingestion on endurance racing in heat and humidity
Cohen BS, Nelson AG, Prevost MC, Thompson GD, Marx BD, Morris GS
European journal of applied physiology and occupational physiology · 45 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
- 1996-05-01 · Eur J Appl Physiol Occup Physiol · vol. 73 · número 3-4 · págs. 358–363
- Editorial
- Springer Science+Business Media
- Citado
- 88 citas · más que el 70% de estudios similares · 0.7× el promedio de su campo
- Referencias
- 21 trabajos
- Acceso
- De pago
- Áreas de investigación
- Thermoregulation and physiological responses · Coffee research and impacts · Sports Performance and Training
- Palabras clave
- caffeine, ergogenic aids, endurance performance, heat stress, hot and humid conditions, road racing, race time, electrolytes, blood lactate, hematocrit, tympanic temperature, endurance cyclists
- MeSH
- humans, potassium, sodium, lactic acid, caffeine, blood glucose, hematocrit, double-blind method, humidity, physical endurance, running, adult, middle aged, female, male, hot temperature
6 autores
- Barry S. Cohen🇺🇸Louisiana State University
- Arnold G. Nelson🇺🇸Louisiana State University
- Michael C. Prevost🇺🇸Louisiana State University
- Gerald D. Thompson🇺🇸Louisiana State University
- Brian D. Marx🇺🇸Louisiana State University
- George S. Morris🇺🇸Louisiana State University
Resumen
El texto original del estudio, en el idioma en que se publicó.
A hot and humid environment can be detrimental to race performance. Caffeine, on the other hand, has been shown to be an ergogenic aid for improving endurance performance. To examine the influence of caffeine ingestion on race performance during high heat stress, seven endurance trained competitive road racers aged between 23 and 51 years (five men, two women) performed three maximal effort 21-km road races outdoors in hot and humid conditions. The caffeine dose, randomly assigned in a double-blind fashion, consisted of either 0, 5, or 9 mg.kg-1 body mass. During each run, the subjects were allowed to drink water ad libitum at each 5-km point. Blood samples were obtained immediately before and after each run and analysed for changes in concentrations of Na+, K+, glucose, lactate, and hematocrit. Pre and postrun data were also collected for body mass and tympanic membrane temperature. Race times were not significantly different among the races or caffeine doses, with the average times within 1.1% of each other. In addition, none of the other variables measured varied significantly among the races or caffeine doses. In summary, caffeine intake did not affect race performance. Therefore it was concluded from our study that caffeine is not of ergogenic benefit in endurance races during high heat stress.
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