Caffeine is ergogenic after supplementation of oral creatine monohydrate
Doherty M, Smith PM, Davison RC, Hughes MG
Medicine and science in sports and exercise · 50 citas
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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
- 2002-11-01 · Med Sci Sports Exerc · vol. 34 · número 11 · págs. 1785–1792
- Editorial
- Lippincott Williams & Wilkins
- Citado
- 82 citas · más que el 81% de estudios similares · 1.3× el promedio de su campo
- Referencias
- 29 trabajos
- Acceso
- De pago
- Áreas de investigación
- Coffee research and impacts · Muscle metabolism and nutrition · Sports Performance and Training
- Palabras clave
- caffeine, creatine monohydrate, ergogenic aids, creatine loading, caffeine abstinence, high-intensity exercise, oxygen consumption, rating of perceived exertion, catecholamines, blood lactate, potassium, body mass
- MeSH
- humans, creatine, caffeine, central nervous system stimulants, exercise test, blood gas analysis, blood chemical analysis, analysis of variance, probability, sensitivity and specificity, double-blind method, energy metabolism, anaerobic threshold, muscle fatigue, physical endurance, running, reference values, dietary supplements, adult, male, physical exertion
4 autores
- Mike Doherty
- Paul M. Smith
- Richard R. Davison
- Michael G. Hughes
Resumen
El texto original del estudio, en el idioma en que se publicó.
Purpose
The purpose of this investigation was to assess the acute effects of caffeine ingestion on short-term, high-intensity exercise (ST) after a period of oral creatine supplementation and caffeine abstinence.
Methods
Fourteen trained male subjects performed treadmill running to volitional exhaustion (T(lim)) at an exercise intensity equivalent to 125% VO(2max). Three trials were performed, one before 6 d of creatine loading (0.3 g x kg x d(-1) baseline), and two further trials after the loading period. One hour before the postloading trials, caffeine (5 mg x kg(-1)) or placebo was orally ingested in a cross-over, double-blind fashion. Four measurements of rating of perceived exertion were taken, one every 30 s, during the first 120 s of the exercise. Blood samples were assayed for lactate, glucose, potassium, and catecholamines, immediately before and after exercise.
Results
Body mass increased (P < 0.05) over the creatine supplementation period, and this increase was maintained for both caffeine and placebo trials. There was no increase in the maximal accumulated oxygen deficit between trials; however, total VO(2) was significantly increased in the caffeine trial in comparison with the placebo trial (13.35 +/- 3.89 L vs 11.67 +/- 3.61 L). In addition, caffeine T(lim) (222.1 +/- 48.9 s) was significantly greater (P < 0.05) than both baseline (200.8 +/- 33.4 s) and placebo (198.3 +/- 45.4 s) T(lim). RPE was also lower at 90 s in the caffeine treatment (13.8 +/- 1.8 RPE points) in comparison with baseline (14.6 +/- 1.9 RPE points).
Conclusion
As indicated by a greater T(lim), acute caffeine ingestion was found to be ergogenic after 6-d of creatine supplementation and caffeine abstinence.
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