Journal
INTERNATIONAL JOURNAL OF SPORTS MEDICINE
Volume 28, Issue 11, Pages 921-927Publisher
GEORG THIEME VERLAG KG
DOI: 10.1055/s-2007-964987
Keywords
F2-isoprostanes; ferric reducing ability of plasma (FRAP); endurance exercise
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Carbohydrate administration during exercise diminishes stress hormone release, but the relationship of these hormones with oxidative stress has not been examined. Fifteen subjects functioned as their own controls and ingested carbohydrate (6%) or placebo in a randomized design while cycling for 2.5-h (similar to 75% VO2peak).Blood and skeletal muscle samples were collected 30 min pre-exercise, immediately post-exercise, and 12-h post-exercise and analyzed for F-2-isoprostanes, ferric reducing ability of plasma, glucose, insulin, cortisol, epinephrine, and muscle glycogen, respectively. Statistical design was a 2 (treatment) x 3 (time) repeated measures analysis of variance. Glucose, insulin, and ferric reducing ability of plasma were significantly higher and F-2-isoprostanes, cortisol, and epinephrine significantly lower in carbohydrate versus placebo. The decrease in muscle glycogen was not different. During cycling exercise, oxidative stress appears to be heavily influenced by carbohydrate ingestion and increased stress hormones.
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