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Asia Pac J Clin Nutr. 1999 Jun;8(2):136-41.

Effects of dumb-bell exercise with and without energy restriction on resting metabolic rate, diet-induced thermogenesis and body composition in mildly obese women.

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Division of Nutrition and Biochemistry, Sanyo Women's College, Hiroshima, Japan.


The effects of dumb-bell exercise (aerobic-resistance exercise) with and without low calorie diet (LCD) therapy on resting metabolic rate (RMR), diet-induced thermogenesis (DIT) and body composition were studied in 12 mildly obese women aged 19-20 years. The subjects were randomly assigned to one of the following two groups: dumb-bell exercise with LCD (DEx + LCD group), and dumb-bell exercise only (DEx group). The subjects performed dumb-bell exercises with pairs of 2 kg dumb-bells every day after dinner for approximately 20 min. In the DEx + LCD group, subjects also received a liquid-formula diet based on a commercially available diet supplement, Micro Diet, for two of their three daily meals. Thus, they were restricted to approximately 4.18 MJ of energy intake per day for 12 weeks. Subjects underwent several measurements (body composition, RMR and DIT tests) before commencing the experiment and again after 12 weeks while still dieting. During the 12 week experimental period, body weight and body fat decreased significantly in both the DEx + LCD and the DEx groups without reducing fat free mass (FFM). The decreases in body weight and body fat were significantly larger in the LCD + DEx group than in the DEx group. These results suggest that dumb-bell exercise decreases body weight and body fat without reducing FFM in relation to increasing RMR and DIT. Micro Diet LCD may strengthen the effect of dumb-bell exercise on body weight and body fat, but weaken the effects on RMR and DIT.

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