Effect of weight loss programs with and without physical exercise on resting metabolic rate in women.

Restri??o diet?tica ? associada com a perda de massa corporal magra (MCM) e diminui??o da taxa metab?lica de repouso (TMR), e isto favorece a recupera??o do peso. Sugere-se que a combina??o de exerc?cio e dieta compensaria a diminui??o da TMR. O objetivo do estudo foi comparar os efeitos da dieta mais exerc?cio com efeitos da dieta somente na TMR ap?s programa de emagrecimento de oito semanas. Vinte mulheres pr?-menopausa (idade = 27?5.13 anos; estatura = 1.64?0.05 m e percentual de gordura = 35.6?3.7) participaram do experimento. Elas foram divididas em dois grupos: dieta somente (DO, n = 11) e dieta mais exerc?cio (DE, n = 9). O grupo DO recebeu dieta correspondente a 80% da TMR. O grupo DE recebeu uma dieta correspondente a 80% da taxa metab?lica de repouso e se exercitou durante 45 minutos, tr?s vezes por semana na intensidade de 65-75% da FCmax. Os dois grupos perderam quantidades similares de gordura corporal, mas somente o DO perdeu MCM. Houve diminui??o significante na TMR para ambos os grupos, mas essa foi maior para o grupo DO. Concluiu-se que o programa DE foi mais eficiente que o DO para prevenir diminui??o na TMR e MCM.Dietary restriction is associated with lean body weight (LBW) losses and decrease in resting metabolic rate (RMR), and this favors weight regain. It has been suggested that the combination of exercise and diet would compensate for the lowered RMR. The purpose of this research was to compare the effects of a diet with the effects of a diet plus exercise program on RMR after 8-week weight loss program. Twenty premenopausal females (age = 27?5.13 years; height =1.64? .05 m; percent body fat = 35.6?3.7) volunteered for the experiment. They were divided into two groups: diet only group (DO, n=11) and diet plus exercise group (DE, n=9). The DO group received a diet corresponding to 80% of the RMR. The DE group received a diet corresponding to 80% of the RMR and exercise for 45 minutes, three days a week, at 65-75% of the HRmax. The two groups lost similar amounts of body fat, but only the DO group lost LBW. There was a significant decrease in RMR in both groups, but such decrease was significantly greater in the DO group. It was concluded that the DE was more efficient than the DO program for preventing the decrease in LBW and RMR