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Romanian Society for Sports Medicine



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"Medicina Sportiva" No.14 - 2008 The 15-th Sports Medicine Balkan Congress
NUTRITION IN TOP ATHLETES


INFLUENCE OF DARK CHOCOLATE ADMINISTRATION ON URIC ACID, LIVER ENZYMES, LACTATE, GLUCOSE AND TRIGLYCERIDES CHANGES INDUCED BY SUBMAXIMAL EXERCISE IN ATHLETES

T. Djarova1, L. Andreeva2, D. Stefanova2, G. Mateev2, A. Basson1, S. Tzvetkov2, L. Kamenov2
1 University of Zululand, Department of Biochemistry and Microbiology, KwaDlangezwa, South Africa,
2 National Sports Academy, , Sofia, Bulgaria


Introduction. Exercise can produce an imbalance between reactive oxygen species (ROS) and the innate antioxidant defense system resulting in oxidative stress. Considerable interest into the outcomes of antioxidant administration was reported. Dark chocolate is rich of flavinoids excreting positive cardiovascular and metabolic effects.
Materials/Methods. A randomised study of two periods of 10 days (control and administration of 50 grams dark chocolate daily) was carried out with eleven competitive swimmers. Each subject took part of two trials of 15 min  submaximal exercise on bicycle ergometer consisting of two bouts of 10 min at intensity 60% VO2max and 5 min at  90%VO2max  conducted without an interval to induce oxidative stress.
Results. Uric acid after performing pre-administration submaximal exercise was elevated by 11.7% (p<0.05) at the end of control period but dropped by 10.9% in response to 10 days of chocolate intake. Blood lactate increased immediately following the submaximal tests up to 6.6 mmol/l and 6.1 mmol/l respectively. Lactate was significantly lower after the dark chocolate treatment. Following submaximal tests pre-administration glucose was elevated to 5.65 mmol/l whereas post chocolate  administration glucose levels were reduced significantly. Liver enzymes changes were found within the upper reference range. Post chocolate administration glucose levels were slightly reduced. Aspartate-aminotransferase levels were raised by 14.8% after both tests. No changes in γ-aminotransferase, triglycerides and cholesterol were found.
Conclusion. Dark chocolate administration might modulate and benefit metabolic changes under exercise-induced oxidative stress by reducing ROS production, increasing insulin sensitivity and mobilising liver glutathione to supply muscle tissue.






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