Effects of carbohydrate ingestion before and during exercise on glucose kinetics and performance

1  Exercise Physiology and Metabolism Laboratory, Department of Physiology, The University of Melbourne, Parkville, Victoria 3052; and 2  Exercise Metabolism Group, Department of Human Biology and Movement Science, Royal Melbourne Institute of Technology University, Bundoora, Victoria 3083, Australi...

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Published in:Journal of applied physiology (1985) 2000-12, Vol.89 (6), p.2220-2226
Main Authors: Febbraio, Mark A, Chiu, Alison, Angus, Damien J, Arkinstall, Melissa J, Hawley, John A
Format: Article
Language:English
Subjects:
Adult
Beverages
Bicycling
Biological and medical sciences
Blood Glucose - analysis
Dietary Carbohydrates - administration & dosage
Dietary Carbohydrates - pharmacology
Drug Administration Schedule
Exercise - physiology
Fundamental and applied biological sciences. Psychology
Glucose - metabolism
Humans
Kinetics
Male
Oxidation-Reduction
Physical Endurance - physiology
Vertebrates: body movement. Posture. Locomotion. Flight. Swimming. Physical exercise. Rest. Sports
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Summary:1  Exercise Physiology and Metabolism Laboratory, Department of Physiology, The University of Melbourne, Parkville, Victoria 3052; and 2  Exercise Metabolism Group, Department of Human Biology and Movement Science, Royal Melbourne Institute of Technology University, Bundoora, Victoria 3083, Australia We investigated the effect of carbohydrate (CHO) ingestion before and during exercise and in combination on glucose kinetics, metabolism and performance in seven trained men, who cycled for 120 min (SS) at ~63% of peak power output, followed by a 7 kJ/kg body wt time trial (TT). On four separate occasions, subjects received either a placebo beverage before and during SS (PP); placebo 30 min before and 2 g/kg body wt of CHO in a 6.4% CHO solution throughout SS (PC); 2 g/kg body wt of CHO in a 25.7% CHO beverage 30 min before and placebo throughout SS (CP); or 2 g/kg body wt of CHO in a 25.7% CHO beverage 30 min before and 2 g/kg of CHO in a 6.4% CHO solution throughout SS (CC). Ingestion of CC and CP markedly (>8 mM) increased plasma glucose concentration ([glucose]) compared with PP and PC (5 mM). However, plasma [glucose] fell rapidly at the onset of SS so that after 80 min it was similar (6 mM) between all treatments. After this time, plasma [glucose] declined in both PP and CP ( P  
ISSN:8750-7587
1522-1601
DOI:10.1152/jappl.2000.89.6.2220