Coinciding exercise with peak serum caffeine does not improve cycling performance
Skinner TL, Jenkins DG, Taaffe DR, Leveritt MD, Coombes JS
Journal of science and medicine in sport · 30 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
- 2012-05-31 · J Sci Med Sport · vol. 16 · número 1 · págs. 54–59
- Editorial
- Elsevier BV
- Citado
- 54 citas · más que el 81% de estudios similares · 1.7× el promedio de su campo
- Referencias
- 30 trabajos
- Acceso
- Lectura gratuita
- Áreas de investigación
- Coffee research and impacts · Sports Performance and Training · Thermoregulation and physiological responses
- Palabras clave
- caffeine, endurance performance, cycling performance, time trial, plasma glucose, norepinephrine, epinephrine, trained cyclists, triathletes
- MeSH
- humans, epinephrine, norepinephrine, caffeine, blood glucose, central nervous system stimulants, cross-over studies, double-blind method, physical endurance, time factors, bicycling, adult, male, athletic performance, performance-enhancing substances
5 autores
- Tina L. Skinner🇦🇺 · autor de correspondenciaThe University of Queensland
- David Jenkins🇦🇺The University of Queensland
- Dennis R. Taaffe🇦🇺The University of Queensland; University of Newcastle Australia
- MICHAEL D. LEVERITT🇦🇺Griffith University
- Jeff Scott Coombes🇦🇺The University of Queensland
Resumen
El texto original del estudio, en el idioma en que se publicó.
Objectives
To investigate whether coinciding peak serum caffeine concentration with the onset of exercise enhances subsequent endurance performance.
Design
Randomised, double-blind, crossover.
Methods
In this randomised, placebo-controlled, double-blind crossover study, 14 male trained cyclists and triathletes (age 31±5year, body mass 75.4±5.7 kg, VO₂max 69.5±6.1 mL kg⁻¹ min⁻¹ and peak power output 417±35W, mean±SD) consumed 6 mg kg(-1) caffeine or a placebo either 1h (C(1h)) prior to completing a 40 km time trial or when the start of exercise coincided with individual peak serum caffeine concentrations (C(peak)). C(peak) was determined from a separate 'caffeine profiling' session that involved monitoring caffeine concentrations in the blood every 30 min over a 4h period.
Results
Following caffeine ingestion, peak serum caffeine occurred 120 min in 12 participants and 150 min in 2 participants. Time to complete the 40 km time trial was significantly faster (2.0%; p=0.002) in C(1h) compared to placebo. No statistically significant improvement in performance was noted in the C(peak) trial versus placebo (1.1%; p=0.240). Whilst no differences in metabolic markers were found between C(peak) and placebo conditions, plasma concentrations of glucose (p=0.005), norepinephrine and epinephrine (p≤0.002) were higher in the C(1h) trial 6 min post-exercise versus placebo.
Conclusions
In contrast to coinciding peak serum caffeine concentration with exercise onset, caffeine consumed 60 min prior to exercise resulted in significant improvements in 40 km time trial performance. The ergogenic effect of caffeine was not found to be related to peak caffeine concentration in the blood at the onset of endurance exercise.
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