Substrate metabolism and exercise performance with caffeine and carbohydrate intake
Hulston CJ, Jeukendrup AE
Medicine and science in sports and exercise · 43 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
- 2008-11-14 · Med Sci Sports Exerc · vol. 40 · número 12 · págs. 2096–2104
- Editorial
- Lippincott Williams & Wilkins
- Citado
- 84 citas · más que el 93% de estudios similares · 3.9× el promedio de su campo
- Impacto
- Entre el 10 % más citado de su campo
- Referencias
- 41 trabajos
- Acceso
- De pago
- Áreas de investigación
- Coffee research and impacts · Muscle metabolism and nutrition · Sports Performance and Training
- Palabras clave
- caffeine, carbohydrate intake, glucose oxidation, glucose kinetics, exercise performance, endurance cycling, time trial performance, substrate metabolism, endurance cyclists
- MeSH
- humans, caffeine, dietary carbohydrates, glucose, central nervous system stimulants, placebos, task performance and analysis, oxidation-reduction, bicycling, adult, male, gas chromatography-mass spectrometry
2 autores
- Carl J. Hulston🇬🇧University of Birmingham
- Asker Erik Jeukendrup🇬🇧University of Birmingham
Resumen
El texto original del estudio, en el idioma en que se publicó.
Purpose
1) To investigate the effect of caffeine on exogenous carbohydrate (CHO) oxidation and glucose kinetics during exercise; and 2) to determine whether combined ingestion of caffeine and CHO enhanced cycling performance compared with CHO alone.
Methods
Ten endurance-trained cyclists performed three experimental trials consisting of 105 min steady-state (SS) cycling at 62% VO2max followed by a time trial (TT) lasting approximately 45 min. During exercise, subjects ingested either of the following: a 6.4% glucose solution (GLU), a 6.4% glucose plus caffeine solution providing 5.3 mg kg(-1) of caffeine (GLU + CAF), or a placebo (PLA). Glucose solutions contained a trace amount of [U-C]glucose, and eight subjects received a primed continuous [6,6-H2]glucose infusion.
Results
Peak exogenous CHO oxidation rates were not significantly different between GLU and GLU + CAF trials (52.6 +/- 2.7 and 49.1 +/- 2.1 micromol kg.min(-1), respectively). Rates of appearance (Ra) and disappearance (Rd) of glucose were significantly higher with CHO ingestion than PLA (P < 0.01) but were not significantly different between GLU and GLU + CAF trials. Performance times were 43.45 +/- 0.86, 45.45 +/- 1.07, and 47.40 +/- 1.30 min for GLU + CAF, GLU, and PLA, respectively. Therefore, GLU + CAF ingestion enhanced TT performance by 4.6% (P < 0.05) compared with GLU and 9% (P < 0.05) compared with PLA.
Conclusion
The coingestion of caffeine (5.3 mg kg(-1)) with CHO during exercise enhanced TT performance by 4.6% compared with CHO and 9.0% compared with water placebo. However, caffeine did not influence exogenous CHO oxidation or glucose kinetics during SS exercise.
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