Independent and combined effects of carbohydrate and caffeine ingestion on aerobic cycling performance in the fed state
Acker-Hewitt TL, Shafer BM, Saunders MJ, Goh Q, Luden ND
Applied physiology, nutrition, and metabolism = Physiologie appliquee, nutrition et metabolisme · 31 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
- 2012-04-01 · Appl Physiol Nutr Metab · vol. 37 · número 2 · págs. 276–283
- Editorial
- NRC Research Press
- Citado
- 42 citas · más que el 82% de estudios similares · 1.7× el promedio de su campo
- Referencias
- 53 trabajos
- Acceso
- De pago
- Áreas de investigación
- Coffee research and impacts · Sports Performance and Training · Muscle metabolism and nutrition
- Palabras clave
- carbohydrate intake, caffeine ingestion, time trial performance, fed state, respiratory exchange ratio, blood glucose, combination supplementation, cyclists
- MeSH
- muscle, skeletal, humans, lactic acid, caffeine, dietary carbohydrates, blood glucose, exercise test, exercise, diet, double-blind method, energy metabolism, oxygen consumption, energy intake, heart rate, adult, male, young adult
5 autores
- Tiffany L. Acker🇺🇸James Madison University
- Brooke M. Shafer🇺🇸James Madison University
- Michael John Saunders🇺🇸James Madison University
- Qingnian Goh🇺🇸James Madison University
- Nicholas D. Luden🇺🇸James Madison University
Resumen
El texto original del estudio, en el idioma en que se publicó.
The purpose of this study was to examine the independent and combined effects of carbohydrate and caffeine ingestion on performance and various physiological parameters during aerobic cycling (∼1 h). Ten male cyclists (28 ± 9 years, 73 ± 6 kg, 66 ± 9 mL·kg(-1)·min(-1) maximal oxygen consumption) performed 20 min of steady-state (SS) cycling (60% peak power (W(max))) followed by a simulated 20-km time trial (TT) under placebo (PLA), carbohydrate (CHO), caffeine (CAF), and combined CAF-CHO conditions, all of which were performed in the fed state. CAF-CHO improved TT performance by 3.4% ± 2% (84 ± 57 s) compared with PLA (p < 0.05), whereas no differences were detected among CHO, CAF, and PLA. The SS respiratory exchange ratio was elevated in CHO (0.92 ± 0.03), CAF (0.96 ± 0.07), and CAF-CHO (0.95 ± 0.02) compared with PLA (0.89 ± 0.03) (p < 0.05). Post-SS and post-TT blood glucose levels were also elevated in CAF-CHO (88.3 ± 16.7 mg·dL(-1) and 111.2 ± 33.5 mg·dL(-1), respectively) compared with PLA (74.5 ± 9.8 mg·dL(-1) and 85.4 ± 17.6 mg·dL(-1), respectively) (p < 0.05). Treatment conditions did not differentially impact SS pulmonary ventilation, oxygen consumption, heart rate, peak quadriceps muscle strength, rating of perceived exertion, or blood lactate. CAF and CHO improved TT performance when taken together but not independently. Although the present work did not yield any definitive physiological mechanisms for the performance findings, these data suggest that cyclists in the fed state should ingest carbohydrate and caffeine together to improve time trial performance.
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