American Journal of Clinical Nutrition, Vol 49, 409-416, Copyright © 1989 by The American Society for Clinical Nutrition, Inc

ORIGINAL RESEARCH COMMUNICATIONS

Repetitive weight loss and weight regain: effects on weight reduction, resting metabolic rate, and lipolytic activity before and after exercise and/or diet treatment

D van Dale and WH Saris
Department of Human Biology, University of Limburg, Maastricht, The Netherlands.

Body composition, maximal aerobic power (VO2 max), resting metabolic rate (RMR), and lipolytic activity of abdominal adipocytes were measured in 20 women (body mass index [BMI] = 33.5) during 14 wk of exercise training (4 h/wk at 60% of VO2 max) and dietary restriction (840 kcal/d). Frequent dieters (yo-yo) and women without a dietary history (non-yo-yo) were matched into the following groups: diet- exercise yo-yo (DE-Y), diet-exercise non-yo-yo (DE-NY), and diet-non-yo- yo group (D-NY). After 14 wk significant differences in weight loss and fat loss were revealed between D and DE groups but not between yo-yo and non-yo-yo dieters. RMR decreased in all groups but there was a significantly smaller decline after 14 wk for the diet-exercise groups. No effects of frequent dieting or exercise on basal and stimulated lipolytic activity were observed.

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