Exercício físico, dieta rica em frutose e marcadores da síndrome metabólica em ratos
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Data
2009-07-29
Autores
Botezelli, José Diego [UNESP]
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Editor
Universidade Estadual Paulista (Unesp)
Resumo
O presente estudo visou analisar os efeitos do exercício de caráter aeróbio sobre marcadores de esteatose hepática não alcoólica (EHNA), tolerância à glicose, sensibilidade à insulina e capacidade aeróbia de ratos mantidos em dieta rica em frutose. Foram utilizados ratos da linhagem Wistar que foram separados em dois grupos, conforme a dieta recebida: controle (dieta balanceada AIN-93 G) e frutose (dieta com 60% de frutose). Esses animais foram submetidos a testes de máximo estado estável de lactato (MEEL) para a identificação da transição metabólica aeróbia/anaeróbia durante exercício de natação aos 28, 90 e 120 dias de idade. Um terço dos animais de cada grupo foi submetido ao treinamento por natação, em intensidade equivalente ao MEEL, 1 h/dia, 5 dias/semana dos 28 aos 120 dias (protocolo precoce), outro terço foi submetido ao mesmo treinamento dos 90 aos 120 dias (protocolo tardio) e os restantes, permaneceram sedentários. As principais análises efetuadas foram: capacidade aeróbia (MEEL), tolerância à glicose (oGTT); sensibilidade periférica à insulina (ITT); marcadores de EHNA (concentrações séricas de alanina aminotransferase [ALT], aspartato aminotransferase [AST], fosfatase alcalina e as concentrações hepáticas de lipídios [totais] e concentração de triglicerídeos séricos [TG]). O treinamento precoce reduziu a carga de trabalho no MEEL do lactato dos animais alimentados com ambas as dietas. Já o treinamento tardio aumentou essa carga de trabalho nos ratos alimentados com dieta controle. O treinamento tardio, também reduziu a área sob a curva de glicose durante GTT nos ratos controle. A dieta rica em frutose diminuiu a sensibilidade à insulina dos animais. No entanto, o protocolo de exercício tardio foi eficiente em melhorar esse aspecto. Não houve diferença entre os grupos nas concentrações de ALT séricas, no entanto...
This study aimed to analyze the effects of aerobic exercise on markers of non alcoholic steatohepatitis (EHNA), glucose tolerance, insulin sensitivity and aerobic capacity of rats kept on a fructose rich diet. We used rats of Wistar strain which were separated into two groups according to diet: control (balanced diet AIN-93 G) and fructose (diet with 60% fructose). These animals were tested for maximum lactate steady state (MEEL) to identify the aerobic / anaerobic metabolic transition exercise during swimming at 28, 90 and 120 days of age. One third of the animals in each group was subjected to swimming training at intensity equivalent to MEEL, 1 h / day, 5 days / week from 28 to 120 days (early protocol), another third was submitted to the training from 90 to 120 days (late Protocol) and the others remained sedentary. The main tests performed were: aerobic capacity (MEEL), glucose tolerance (oGTT) peripheral sensitivity to insulin (ITT), markers of EHNA (serum alanine aminotransferase [ALT], aspartate aminotransferase [AST], alkaline phosphatase and hepatic concentrations of lipids [total], and concentration of serum triglycerides [TG]). The early protocol reduced the workload on MEEL in animals fed both diets. On the other hand, the later training increased work load in rats fed control diet. The later training, also reduced the areas under the glucose curve during oGTT in control rats. The fructose rich diet decreased sensitivity to insulin in these animals. However, the later exercise protocol was efficient in improving this. There was no difference between groups in concentrations of serum ALT, but the concentrations of AST increased in the fructose sedentary group compared to other groups. There was an increase in liver lipids of animals fed with fructose rich diet and sedentary. Serum concentrations of triglycerides were increased in high fructose trained groups compared with... (Complete abstract click electronic access below)
This study aimed to analyze the effects of aerobic exercise on markers of non alcoholic steatohepatitis (EHNA), glucose tolerance, insulin sensitivity and aerobic capacity of rats kept on a fructose rich diet. We used rats of Wistar strain which were separated into two groups according to diet: control (balanced diet AIN-93 G) and fructose (diet with 60% fructose). These animals were tested for maximum lactate steady state (MEEL) to identify the aerobic / anaerobic metabolic transition exercise during swimming at 28, 90 and 120 days of age. One third of the animals in each group was subjected to swimming training at intensity equivalent to MEEL, 1 h / day, 5 days / week from 28 to 120 days (early protocol), another third was submitted to the training from 90 to 120 days (late Protocol) and the others remained sedentary. The main tests performed were: aerobic capacity (MEEL), glucose tolerance (oGTT) peripheral sensitivity to insulin (ITT), markers of EHNA (serum alanine aminotransferase [ALT], aspartate aminotransferase [AST], alkaline phosphatase and hepatic concentrations of lipids [total], and concentration of serum triglycerides [TG]). The early protocol reduced the workload on MEEL in animals fed both diets. On the other hand, the later training increased work load in rats fed control diet. The later training, also reduced the areas under the glucose curve during oGTT in control rats. The fructose rich diet decreased sensitivity to insulin in these animals. However, the later exercise protocol was efficient in improving this. There was no difference between groups in concentrations of serum ALT, but the concentrations of AST increased in the fructose sedentary group compared to other groups. There was an increase in liver lipids of animals fed with fructose rich diet and sedentary. Serum concentrations of triglycerides were increased in high fructose trained groups compared with... (Complete abstract click electronic access below)
Descrição
Palavras-chave
Fisiologia, Exercícios físicos, Frutose, Rato como animal de laboratorio, Síndrome metabólica, Esteatose hepática não alcoólica, Metabolic syndrome, Non-alcoholic steatosis, Physical activity, Fructose, Rats
Como citar
BOTEZELLI, José Diego. Exercício físico, dieta rica em frutose e marcadores da síndrome metabólica em ratos. 2009. 84 f. Dissertação (mestrado) - Universidade Estadual Paulista, Instituto de Biociências de Rio Claro, 2009.