Metabolic catecholamine, and endurance responses to caffeine during intense exercise
Jackman M, Wendling P, Friars D, Graham TE
Journal of applied physiology (Bethesda, Md. : 1985) · 89 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
- 1996-10-01 · J Appl Physiol (1985) · vol. 81 · número 4 · págs. 1658–1663
- Editorial
- American Physiological Society
- Citado
- 207 citas · más que el 93% de estudios similares · 3.6× el promedio de su campo
- Impacto
- Entre el 10 % más citado de su campo
- Referencias
- 38 trabajos
- Acceso
- De pago
- Áreas de investigación
- Coffee research and impacts · Muscle metabolism and nutrition · Sports Performance and Training
- Palabras clave
- caffeine, ergogenic aids, endurance, high-intensity exercise, muscle metabolism, catecholamines, epinephrine, norepinephrine, blood lactate, muscle glycogen, fatigue, VO2max, cycling
- MeSH
- muscle, skeletal, humans, norepinephrine, catecholamines, lactic acid, caffeine, glycogen, central nervous system stimulants, exercise test, exercise, double-blind method, energy metabolism, oxygen consumption, physical endurance, adult, female, male
4 autores
- M. Jackman🇨🇦University of Guelph
- P. Wendling🇨🇦University of Guelph
- D. Friars🇨🇦University of Guelph
- Terry E. Graham🇨🇦University of Guelph
Resumen
El texto original del estudio, en el idioma en que se publicó.
This study examined the possible effects of caffeine ingestion on muscle metabolism and endurance during brief intense exercise. We tested 14 subjects after they ingested placebo or caffeine (6 mg/kg) with an exercise protocol in which they cycled for 2 min, rested 6 min, cycled 2 min, rested 6 min, and then cycled to voluntary exhaustion. In each exercise the intensity required the subject's maximal O2 consumption. Eight subjects had muscle and venous blood samples taken before and after each exercise period. The caffeine ingestion resulted in a significant increase in endurance (4.12 +/- 0.36 and 4.93 +/- 0.60 min for placebo and caffeine, respectively) and resulted in a significant increase in plasma epinephrine concentration throughout the protocol but not in norepinephrine concentration. During the first two exercise bouts, the power and work output were not different; blood lactate concentrations were not affected significantly by caffeine ingestion, but during the exercise bouts muscle lactate concentration was significantly increased by caffeine. The net decrease in muscle glycogen was not different between treatments at any point in the protocol, and even at the time of fatigue there was at least 50% of the original glycogen concentration remaining. the data demonstrated that caffeine ingestion can be an effective ergogenic aid for exercise that is as brief as 4-6 min. However, the mechanism is not associated with muscle glycogen sparing. It is possible that caffeine is exerting actions directly on the active muscle and/or the neural processes that are involved in the activity.
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