Práticas alimentares, efeito do índice glicêmico e da hidratação no desempenho de ciclistas / Dietary practices, effect of the glycemic índex and hydration on performance of cyclists

AUTOR(ES)
FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

10/12/2010

RESUMO

This dissertation is composed of three studies. First study: the objective was to review the effects of pre-exercise ingestion of high, moderate and low glycemic index (GI) meals on performance. For the first study, was held search in the Medline, Scielo, Science Direct and Pubmed databases. Some studies reveals a positive association between pre-exercise intake of LGI or MOD-GI meal and improvement in physical performance, others observed no significant differences in the distance, at work or at the time of performance testing conducted after consumption of meals differing in GI. Well-controlled studies are required to evaluated the effect of the GI on performance. Second study: the objective was to investigate the breakfast dietary habits and nutritional strategies used before and during training and competition, in mountain bikers. Were interviewed 146 cyclists of the national cyclism competition. The questionnaire included 13 questions about the participants characteristics, pre-exercise eating habits and the systemic or gastrointestinal symptoms during training and competition. All participants consumed pre-competition breakfast. The foods banana, white bread and wholemeal bread were the most consumed for pre-training and pre-competition breakfast. Regarding the use of supplement, 42 % and 58 % of the participants used in the breakfast before of the training and competition, respectively. Most participants indicated the consumption of some supplement during training (88.35 %) and competition (97.26 %). Eighty-six percent (86.3 %) of the participants reported some adverse symptom during the exercise. Although most of the participants ingested pre-exercise breakfast, the majority of selected foods were inadequate. They also showed high supplement consumption before and during the exercise. Third study: the objective was to compare the effect of the GI of meal consumed 30 minutes prior to exercise on metabolic parameters and performance of cyclists with types different hydration (water or isotonic) during exercise on a cycle ergometer. Twelve cyclists consumed a high glycemic index (HGI) or low glycemic index (LGI) meal, 30 minutes before exercise on a cycle ergometer during 90 minutes, followed by performance cycle (6 km). During each trial, was offered water or isotonic. The postprandial glycemic response and areas under the curve (AUC) blood glucose after 30 minutes of the consuming of HGI meals were higher than after ingestion of LGI meals. During exercise, we found that glycemic response in LGI trial and hydration with water (LGIHW) was more stable than in HGI trial and hydration with water (HGIHW). However, when the isotonic was consumed during exercise, there were reduced of the differences in glycemic responses observed after the ingestion of LGI and HGI meals before exercise. There was no significant difference on performance among the trials. The GI of meals did not affect the performance of cyclists with hydration types different during the physical activity.

ASSUNTO(S)

nutricao Índice glicêmico refeição pré-exercício desempenho nutrição esportiva mountain bike hidratação Água isotônico glycemic índex pré-exercise meal performance sports nutrition mountain bike hydration isotonic water

ACESSO AO ARTIGO

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