Estudo em ratos jovens consumindo alimentos nordestinos adicionados com suplemento protÃico e submetidos ao exercÃcio fÃsico

AUTOR(ES)
DATA DE PUBLICAÇÃO

2008

RESUMO

The aim of the present study was to investigate the effects of the ingestion of Nutri Whey Protein by young rats on metabolites and body composition as well as it substitution for conventional protein. The dissertation included two articles: a literature review and an original article. The systematic literature review in specialized print and electronic periodicals identified the current notion among exercise practitioners that it is necessary to consume more than the recommended amount of nutrients, with particular emphasis on the intake of whey protein. In the second article, 108 rats aged 60 days were fed three diets: standard (17% protein), supplemented with 5% whey protein and supplemented with 10% whey protein (both supplemented diets contained 22% protein). The rats were either submitted to exercise or not (sedentary, swimming with and without load) and divided into nine groups (n=12): S, sedentary-standard diet; E, exercised-standard diet; EL, exercised with load-standard diet; S-5, sedentary-diet supplemented with 5% whey protein; E-5, exercised-diet supplemented with 5% whey protein; EL-5, exercised with load-diet supplemented with 5% whey protein; S-10, sedentary-diet supplemented with 10% whey protein; E-10, exercised-diet supplemented with 10% whey protein; EL-10, exercised with load-diet supplemented with 10% whey protein. The following factors were determined: weight gain, food intake, carcass fat, urea, creatinine, alanine (ALT) and aspartate aminotransferase (AST). Results: Both exercise and protein supplementation promoted a significant increase in food intake, which was more pronounced in the groups exercised with load. There was a change in weight in the groups exercised with load (EL, EL5 and EL10), which had significantly lower weight than the remaining groups. There was an interaction between diet and exercise with regard to reduced weight gain. The E, E5 and E10 groups exhibited a significant increase in body fat regardless of the diet consumed. EC5 and EC10 exhibited a significant increase in urea blood levels when compared to the sedentary groups, such that exercise and diet had a significant affect on the increase in urea. The supplemented diets (5% and 10%) promoted a significant increase in creatinine levels regardless of the intensity of exercise. AST underwent a significant increase in all groups submitted to exercise with load (EL, EL5 and EL10) and was intensified by the supplementation of 10% whey protein. The behavior of ALT in relation to physical exercise was similar in the three diets, with a significant increase in the groups exercised with load (EL, EL5 and EL10) in comparison to the other groups. The results lead to the following conclusions: the ingestion of an adequate diet is of summary importance to practitioners of physical activities; a revision of the concept of supplements is necessary; it is also necessary to alert the public as to diets that present risks or are inefficient, respecting an intake of up to 2.0g /kg of body weight/day. The monitoring and regulation of the commercialization and publicity of supplements by the Health Ministry is fundamental, as is the involvement of nutritionists in the prescription and follow-up of supplement use. Whey protein proved to have little effect on the improvement body composition and is contraindicated for sedentary individuals. Regarding biochemical parameters, both supplementation and exercise may have promoted an imbalance in the metabolism, which could be harmful to health

ASSUNTO(S)

whey protein protein supplements exercÃcio fÃsico nutricao suplementos protÃicos whey protein rats suplementaÃÃo ratos protein proteÃna supplementation physical exercise

ACESSO AO ARTIGO

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