A dose of fructose induces oxidative stress during endurance and strength exercise

This study sought to compare the time course changes in oxidative state and glycemic behavior when glucose or glucose plus fructose are consumed before endurance and strength exercise. After two weeks on a controlled diet, 20 physically trained males ingested an oral dose of glucose or glucose plus...

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Published in:Journal of sports sciences 2009-10, Vol.27 (12), p.1323-1334
Main Authors: Fernández, Juan M., Da Silva-Grigoletto, Marzo E., Gómez-Puerto, José R., Viana-Montaner, Bernardo H., Tasset-Cuevas, Inmaculada, Túnez, Isaac, López-Miranda, José, Pérez-Jiménez, Francisco
Format: Article
Language:English
Subjects:
Adult
Apolipoproteins B - blood
Athletes
Biological and medical sciences
Blood Glucose - metabolism
Carbohydrates
Catalase - blood
Cholesterol, LDL - blood
Exercise
Exercise - physiology
Fructose - pharmacology
Fundamental and applied biological sciences. Psychology
Glucose
Glucose - pharmacology
Glutathione - blood
Glycemic Index
glycemic response
Humans
Lipid Peroxides - blood
Male
Muscle Strength - physiology
Nutrition research
Oxidative stress
Oxidative Stress - drug effects
oxidative stress induced by exercise
Physical Endurance - physiology
post-prandial exercise
Vertebrates: body movement. Posture. Locomotion. Flight. Swimming. Physical exercise. Rest. Sports
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Summary:This study sought to compare the time course changes in oxidative state and glycemic behavior when glucose or glucose plus fructose are consumed before endurance and strength exercise. After two weeks on a controlled diet, 20 physically trained males ingested an oral dose of glucose or glucose plus fructose, 15 min before starting a moderate-intensity 30-min session of endurance or strength exercise. The combination resulted in four randomized interventions: glucose or glucose plus fructose + endurance exercise and glucose or glucose plus fructose + strength exercise, which were implemented consecutively in random order at 1-week intervals. Plasma concentration of lipoperoxides, oxidized LDL, reduced glutathione, catalase and glycemia were determined at baseline, during exercise and acute recovery. Following the ingestion of glucose plus fructose, lipoperoxides, catalase and reduced glutathione depletion were significantly higher than following consumption of glucose, for both endurance and strength exercise (P 
ISSN:0264-0414
1466-447X
DOI:10.1080/02640410903266966