Título:	Efeito agudo da reintrodução de carboidratos sobre a composição corporal avaliada por absortometria de raios-x de dupla energia (DXA)
Outros títulos:	Effect of carbohydrate reintroduction on body composition assessed by dual energy x-ray (DXA)
Autor(es):	Melo, Krain Santos de
Orientador(es):	Welker, Alexis Fonseca
Assunto:	Carboidratos - nutrição humana Composição corporal Diabetes - aspectos nutricionais Gordura corporal
Data de publicação:	24-nov-2017
Data de defesa:	31-jul-2017
Referência:	MELO, Krain Santos de. Efeito agudo da reintrodução de carboidratos sobre a composição corporal avaliada por absortometria de raios-x de dupla energia (DXA). 2017. xvi, 34 f. Dissertação (Mestrado em Ciências e Tecnologias em Saúde)—Universidade de Brasília, Brasília, 2017.
Abstract:	The effects of low carbohydrate diets has been intensely investigated in athletes, healthy individuals, obese patients and diabetics. During carbohydrate restriction, there is a decrease in the body's glycogen stores, weight and fat mass. However short-term carbohydrate restriction and/or refeeding may causes large alterations in glycogen stores and weight and may potentially also distort the indicators of body composition. The measurement of body composition is essential to analyze the efficacy of therapeutic interventions, such as the achieved fat loss. In this study, the volunteers initiated a 3-day period of carbohydrate-restricted diet, with ingestion of the other macronutrients ad libidum.Blood glucose level, body weight and body composition were measured in fast state and during 4-hour. The body composition was assessed by dual-energy X-ray absorptiometry scan (DXA). In fast state, the volunteers ingested a solution composed by 144 g of carbohydrates diluted in 350 ml of water and after one hour ingested it again, to reach the top of glycogen synthesis. Maltodextrin and sucrose were used as sources of carbohydrates instead of glucose and fructose to further accelerate gastric emptying and digestion. After three days of carbohydrate restriction, there was a mean weight loss of -2.37 kg. Over the 4 h of carbohydrate refeeding (glycogen loading), mean weight remained invariable. The change in body fat of each volunteer throughout the 4h period of carbohydrate refeeding ranged from 0.4% to 3.4%. Individual changes in body fat ranged from an increase of 3.6% to a fall of -8.4%. The change of body fat was significantly correlated with the initial percentage of lean body mass (p < 0.001): as higher was the lean body mass percentage, the higher was the variation in body fat. Glycemic peak was achieved at 30 min in 37% of volunteers and at 45 min by most of them at 45 min. At 2 h, blood glucose levels remained larger than the euglycemic. To evaluate the changes in body composition specifically induced by fluctuations in glycogen concentration may cause, we measured body composition after short-term carbohydrate restriction and refeeding. We aim to verify at an acute time (and lower than that observed in the methodologies of the articles) the body alterations, besides to determine if the DXA would be able to evaluate them.
Unidade Acadêmica:	Faculdade de Ciências e Tecnologias em Saúde (FCTS) – Campus UnB Ceilândia
Informações adicionais:	Dissertação (mestrado)—Universidade de Brasília, Faculdade de Ceilândia, Programa de Pós-Graduação em Ciências e Tecnologias em Saúde, 2017.
Programa de pós-graduação:	Programa de Pós-Graduação em Ciências e Tecnologias em Saúde
Licença:	A concessão da licença deste item refere-se ao termo de autorização impresso assinado pelo autor com as seguintes condições: Na qualidade de titular dos direitos de autor da publicação, autorizo a Universidade de Brasília e o IBICT a disponibilizar por meio dos sites www.bce.unb.br, www.ibict.br, http://hercules.vtls.com/cgi-bin/ndltd/chameleon?lng=pt&skin=ndltd sem ressarcimento dos direitos autorais, de acordo com a Lei nº 9610/98, o texto integral da obra disponibilizada, conforme permissões assinaladas, para fins de leitura, impressão e/ou download, a título de divulgação da produção científica brasileira, a partir desta data.
DOI:	http://dx.doi.org/10.26512/2017.07.D.25275
Aparece nas coleções:	Teses, dissertações e produtos pós-doutorado

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