Caffeine ingestion does not impede the resynthesis of proglycogen and macroglycogen after prolonged exercise and carbohydrate supplementation in humans
Battram DS, Shearer J, Robinson D, Graham TE
Journal of applied physiology (Bethesda, Md. : 1985) · 28 citas
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 independiente
- Gobierno
- Natural Sciences and Engineering Research Council of Canada
Según 1 financiador declarado.
Publicación
- Publicado
- 2004-02-06 · J Appl Physiol (1985) · vol. 96 · número 3 · págs. 943–950
- Editorial
- American Physiological Society
- Citado
- 61 citas · más que el 79% de estudios similares · 1.5× el promedio de su campo
- Referencias
- 38 trabajos
- Acceso
- De pago
- Áreas de investigación
- Muscle metabolism and nutrition · Coffee research and impacts · Metabolism, Diabetes, and Cancer
- Palabras clave
- caffeine, glycogen resynthesis, muscle glycogen depletion, carbohydrate supplementation, glycogen synthase, post-exercise recovery, insulin, blood glucose
- MeSH
- humans, caffeine, glycogen, dietary carbohydrates, exercise test, analysis of variance, double-blind method, time factors, dietary supplements, adult, male, physical exertion
4 autores
- Danielle S. Battram🇨🇦University of Guelph
- Jane Shearer
- D. Robinson
- Terry E. Graham
Resumen
El texto original del estudio, en el idioma en que se publicó.
The purpose of this study was to examine the effects of caffeine (Caf) ingestion on pro- (PG) and macroglycogen (MG) resynthesis in 10 healthy men. Subjects completed two trials, consisting of a glycogen-depleting exercise, while ingesting either Caf or placebo capsules. Throughout recovery, biopsies were taken at 0 (exhaustion), 30, 120, and 300 min, and 75 g of carbohydrate were ingested at 0, 60, 120, 180, and 240 min. Whereas Caf ingestion resulted in a higher blood glucose concentration and decreased glycogen synthase fractional velocity (P <or= 0.05), no effect was observed in either the amount or rate of PG and MG resynthesis. PG concentration increased significantly at each time point during recovery, whereas MG concentration remained unchanged until 120 min. The net rate of PG resynthesis was 115 mmol x kg dw(-1) x h(-1) during the first 30 min of recovery, and then it significantly decreased by 62% throughout the remaining 4.5 h of recovery. The net rate of MG resynthesis was 77% lower than the net rate of PG resynthesis during the first 30 min of recovery and remained constant throughout 5 h of recovery despite increasing levels of insulin. In conclusion, Caf ingestion does not impede the resynthesis of PG or MG after an extensive depletion of muscle glycogen and with the provision of exogenous dietary carbohydrate.
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