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Effect of alcohol intake on muscle glycogen storage after prolonged exercise
- Source :
- Journal of Applied Physiology. 95:983-990
- Publication Year :
- 2003
- Publisher :
- American Physiological Society, 2003.
-
Abstract
- We studied the effects of alcohol intake on postexercise muscle glycogen restoration with samples from vastus lateralis being collected immediately after glycogen-depleting cycling and after a set recovery period. Six well-trained cyclists undertook a study of 8-h recovery (2 meals), and another nine cyclists undertook a separate 24-h protocol (4 meals). In each study, subjects completed three trials in crossover order: control (C) diet [meals providing carbohydrate (CHO) of 1.75 g/kg]; alcohol-displacement (A) diet (1.5 g/kg alcohol displacing CHO energy from C) and alcohol + CHO (AC) diet (C + 1.5 g/kg alcohol). Alcohol intake reduced postmeal glycemia especially in A trial and 24-h study, although insulin responses were maintained. Alcohol intake increased serum triglycerides, particularly in the 24-h study and AC trial. Glycogen storage was decreased in A diets compared with C at 8 h (24.4 ± 7 vs. 44.6 ± 6 mmol/kg wet wt, means ± SE, P < 0.05) and 24 h (68 ± 5 vs. 82 ± 5 mmol/kg wet wt, P < 0.05). There was a trend to reduced glycogen storage with AC in 8 h (36.2 ± 8 mmol/kg wet wt, P = 0.1) but no difference in 24 h (85 ± 9 mmol/kg wet wt). We conclude that 1) the direct effect of alcohol on postexercise glycogen synthesis is unclear, and 2) the main effect of alcohol intake is indirect, by displacing CHO intake from optimal recovery nutrition practices.
- Subjects :
- Adult
Blood Glucose
Male
medicine.medical_specialty
Physiology
Vastus lateralis muscle
medicine.medical_treatment
Physical exercise
chemistry.chemical_compound
Physiology (medical)
Internal medicine
Dietary Carbohydrates
medicine
Humans
Insulin
Exercise physiology
Muscle, Skeletal
Exercise
Triglycerides
Cross-Over Studies
Ethanol
Glycogen
Chemistry
Central Nervous System Depressants
Metabolism
Crossover study
Bicycling
Diet
Endocrinology
Subjects
Details
- ISSN :
- 15221601 and 87507587
- Volume :
- 95
- Database :
- OpenAIRE
- Journal :
- Journal of Applied Physiology
- Accession number :
- edsair.doi.dedup.....88da573383ea926fcc609ca30601959e