Biochemical Effects of Carbohydrate Supplementation in a Simulated Competition of Short Terrestrial Duathlon

Biochemical Effects of Carbohydrate Supplementation in a Simulated Competition of Short Terrestrial Duathlon
Recieved November 18, 2005/Accepted November 8, 2006
Renata Teixeira Mamus1, Maria Gisele dos Santos2, Bill Campbell3, & Richard Kreider3
Journal of the International Society of Sports Nutrition

Department of Physical Education, Dom Bosco Faculty1; Department of Physical Education, Federal University of Paran? (UFPR), Curitiba, Paran?, Brazil2. Exercise and Sport Nutrition Lab, Baylor University, Waco TX3. Address correspondence to rtmamus@yahoo.com.br.

ABSTRACT
The purpose of the present study was to investigate the biochemical effects of carbohydrate supplementation in a simulated competition of short terrestrial duathlon. Ten duathletes participated in a simulated competition of short terrestrial duathlon 30 minutes after the ingestion of a 6% (30g/500ml) maltodextrin solution (MALT) or a placebo (PLA). This solution was also ingested every 15 minutes during the competition (12g/200ml); and immediately after the competition (18g/300ml). Samples of blood were collected at 3 time points: 1) at rest 1 hour before the beginning of the competition; 2) during the competition (approximately 1 hour and 45 minutes after the 1st collection); 3) immediately after the competition. Blood was analyzed for blood glucose, lactate, insulin and cortisol. Significant differences were observed in relation to blood glucose levels between MALT and PLA in the post-competition phase. There was also a significant difference in the lactate levels observed between MALT and PLA during the competition phase. Similarly, a significant difference in the cortisol concentrations during and after the competition phases (MALT and PLA) were observed. We conclude that maltodextrin supplementation appears to be beneficial during short terrestrial duathlon competition as evidenced by biochemical markers. Journal of the International Society of Sports Nutrition. 3(2): 6-11, 2006

Key-words: sports nutrition, carbohydrates; blood glucose; lactate; insulin; cortisol.

Complete article may be viewed online.