Efeito da depleção seletiva de glicogênio muscular das fibras do tipo I e II sobre a estratégia de prova em ciclismo de média duração

Abstract

It has been shown that CHO availability of CHO increases performance. Moreover, such improvements may be provided by a CHO supplementation, days before, minutes before or during exercise. On the other hand, the CHO depletion, more specifically of the muscle glycogen (MGD), can impair performance. This decline in performance may occur in constant and varied intensity exercises, as in the time trials (TT). The manner as an athlete programs the execution of a TT is called pacing strategy. The pacing strategy may be influenced by the initial concentrations of MG. Thus, the present dissertation consisted of two papers: 1) a review article on the effects of different forms of dietary CHO manipulation on performance in cycling TT and 2) an article of results on the effects of selective MG depletion (type I and II fibers) on pacing strategy during a middle-duration cycling TT. From the observations made in the review article and the findings in the article by results, it can be suggested that further research is needed, since many results are controversial and inconclusive. This would aid coaches and researchers to establish the usefulness of CHO manipulation or perform an adaptation of the pacing strategy in accordance with CHO 'status' of the athlete. However, the development of training programs and researches should carefully observe some methodological aspects.