Pre-exercise high concentration carbohydrate supplementation impairs the performance on high intensity cycling exercise

Autor: de Sousa, M. V., Altimari, L. R., Okano, A. H., Coelho, C. F., Altimari, J. M., Teixeira, O., Simões, H. G., Burini, Roberto Carlos [UNESP], Cyrino, E. S.
Přispěvatelé: University of Mogi das Cruzes, Universidade Estadual de Londrina (UEL), Universidade Federal do Rio Grande do Norte (UFRN), Universidade Federal de Mato Grosso (UFMT), Universidade Estadual de Campinas (UNICAMP), Catholic University of Brasilia (UCB), Universidade Estadual Paulista (Unesp)
Jazyk: Spanish; Castilian
Rok vydání: 2010
Předmět:
Zdroj: Scopus
Repositório Institucional da UNESP
Universidade Estadual Paulista (UNESP)
instacron:UNESP
Popis: Submitted by Vitor Silverio Rodrigues (vitorsrodrigues@reitoria.unesp.br) on 2014-05-27T11:25:25Z No. of bitstreams: 0 Made available in DSpace on 2014-05-27T11:25:25Z (GMT). No. of bitstreams: 0 Previous issue date: 2010-12-01 Objectives. To evaluate the effects of pre-exercise high concentration carbohydrate supplementation on performance, cardiovascular, metabolic and hormonal responses during high intensity cycling exercise. Method. Seven male cyclists (28.7 ± 5.4 years; 65.2 ± 4.7 kg body weight), who performed two continuous exercise trials under placebo (PLA) or carbohydrate (CHO) ingestion at a work rate of 80% VO 2max until exhaustion, participated in the study. The cyclists received 5 ml.kg-1 of a maltodextrin solution diluted at a concentration of 10% (CHO) or placebo (PLA) at 60, 45 and 30 min pre-exercise. Results. A 5.4% reduction in the time to exhaustion was observed in the CHO trial compared to the PLA trial. In both trials, glucose and lactate levels were higher in the post-trial condition compared to pre-exercise values (p < 0.05). Free fatty acid levels were lower in the CHO group than in the PLA group both before and after the trial (p < 0.05). Insulinemia was higher during the pre-trial in the CHO group (42.7 ± 3.6 μU.ml-1) compared to the PLA condition (11.8 ± 3.3 μU.ml-1) (p < 0.05), and even decreased to 23.8 ± 5.1 μU.ml-1 during exercise after CHO intake (p < 0.05). No significant differences in plasma cortisol were observed between the two trials (p > 0.05). Conclusions. Pre-exercise high concentration CHO supplementation resulted in impaired performance in high intensity cycling exercise and decreased free fatty acid levels. © 2010 Revista Andaluza de Medicina del Deporte. Department of Nutrition University of Mogi das Cruzes, Mogi das Cruzes, SP Group of Study and Research in Neuromuscular System and Exercise (GEPESINE) CEFE State University of Londrina (UEL), PR Group of Study and Research in Integrative Biology of Exercise (GEPEBIEX) Department of Physical Education CCS, Federal University of Rio Grande do Norte (UFRN), RN Faculty of Physical Education Federal University of Mato Grosso (UFMT), MT Faculty of Physical Education State University of Campinas (UNICAMP), Campinas, SP Department of Physical Education Catholic University of Brasilia (UCB), Brasilia, DF Center of Metabolism in Exercise and Nutrition (CeMENutri) School of Medicine Paulista State University (UNESP), Botucatu, SP Center of Metabolism in Exercise and Nutrition (CeMENutri) School of Medicine Paulista State University (UNESP), Botucatu, SP
Databáze: OpenAIRE
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