Effect of caffeine co-ingested with carbohydrate or fat on metabolism and performance in endurance-trained men
Jacobson TL, Febbraio MA, Arkinstall MJ, Hawley JA
Experimental physiology · 34 citas
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- Ensayo controlado aleatorizado (indexado por PubMed)
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- Marcadores de salud y funcionamiento
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Publicación
- Publicado
- 2001-01-01 · Exp Physiol · vol. 86 · número 1 · págs. 137–144
- Editorial
- Wiley
- Citado
- 73 citas · más que el 82% de estudios similares · 1.4× el promedio de su campo
- Referencias
- 0 trabajos
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- Áreas de investigación
- Coffee research and impacts · Muscle metabolism and nutrition · Sports Performance and Training
- Palabras clave
- caffeine, carbohydrate intake, dietary fat intake, substrate oxidation, carbohydrate oxidation, fat oxidation, endurance performance, time trial performance, endurance-trained men, heparin, cycle ergometry, exercise metabolism, dietary fat
- MeSH
- blood, humans, caffeine, dietary carbohydrates, dietary fats, metabolism, energy metabolism, oxidation-reduction, homeostasis, heart rate, physical endurance, time factors, physical education and training, adult, male, physical exertion
4 autores
- Talia L. Jacobson🇦🇺The University of Melbourne; RMIT University
- Mark Anthony Febbraio🇦🇺The University of Melbourne; RMIT University
- Melissa J. Arkinstall🇦🇺The University of Melbourne; RMIT University
- John Alan Hawley🇦🇺 · autor de correspondenciaThe University of Melbourne; RMIT University
Resumen
El texto original del estudio, en el idioma en que se publicó.
We examined the effect of caffeine co-ingested with either carbohydrate or fat on metabolism and performance in eight endurance-trained subjects who performed a random order of four experimental trials consisting of 120 min of steady-state ergometer cycling at 70 % of maximal O(2) uptake (SS) followed by a time trial in which subjects completed a set amount of work (7 kJ kg-1) as quickly as possible. One hour before SS subjects ingested either 2.6 g kg-1 carbohydrate (CHO); 2.6 g kg-1 CHO + 6 mg kg-1 caffeine (CHO + CAF); 1.2 g kg-1 fat with 2000 U I.V. heparin (FAT); or 1.2 g kg-1 fat with 2000 U I.V. heparin + 6 mg kg-1 caffeine (FAT + CAF). The rate of carbohydrate oxidation was higher (micromol kg-1 min-1: CHO, 243 +/- 39 and CHO + CAF, 239 +/- 30 vs. FAT, 196 +/- 48 and FAT + CAF, 191 +/- 55; P < 0.05, values are means +/- S.D.) and the rate of fat oxidation lower (micromol kg-1 min-1: CHO, 19 +/- 8 and CHO + CAF, 22 +/- 7 vs. FAT, 35 +/- 19 and FAT + CAF, 37 +/- 17; P < 0.05) with carbohydrate than fat ingestion. Yet despite lower carbohydrate use with fat feeding, the time taken to complete the time trial was less after carbohydrate than after fat ingestion (min: CHO, 30.37 +/- 7.42 and CHO + CAF, 29.12 +/- 5.62 vs. FAT, 33.02 +/- 8.50 and FAT + CAF, 32.78 +/- 7.70; P < 0.05). We conclude that (1) caffeine co-ingested with either carbohydrate or fat meals has no additive effect on substrate utilization or exercise performance and (2) carbohydrate ingestion before exercise improves subsequent time trial performance compared with fat ingestion. Experimental Physiology (2001) 86.1, 137-144.
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