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Am J Physiol Endocrinol Metab 257: E647-E653, 1989;
0193-1849/89 $5.00
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AJP - Endocrinology and Metabolism, Vol 257, Issue 5 E647-E653, Copyright © 1989 by American Physiological Society

ARTICLES

Energy expenditure during normo- and overfeeding in peripubertal children of lean and obese Pima Indians

D. Freymond, K. Larson, C. Bogardus and E. Ravussin
Clinical Diabetes and Nutrition Section, National Institute of Diabetes and Digestive and Kidney Diseases, Phoenix, Arizona 85016.

We investigated the hypothesis that peripubertal children born to obese parents have a lower 24-h energy expenditure during "weight maintenance" and/or in response to overfeeding when compared with children born to normal-weight parents. Sixteen Southwestern American Indians (12.4 +/- 1.4 yr, 55.5 +/- 14.1 kg, 30 +/- 8% body fat), eight offspring from obese parents [body mass index (BMI) = 40 +/- 6 kg/m2], and eight offspring from thin parents (BMI = 24 +/- 3 kg/m2) were admitted for 8 days to our metabolic ward. The 24-h energy expenditure was measured under eucaloric conditions and on the 3rd day of progressive overfeeding of a mixed diet, i.e., 150, 200, and 200% of weight maintenance on day 1, 2, and 3 of overfeeding. At base line, offspring of obese parents were heavier (64 +/- 15 vs. 47 +/- 6 kg, P less than 0.05) and tended to be fatter (34 +/- 8 vs. 26 +/- 9% body fat, P = 0.07), with a higher absolute fat mass (22 +/- 9 vs. 13 +/- 4 kg body fat, P less than 0.05) when compared with offspring of thin parents. During both normo- and over-feeding, the larger part of the variance in 24-h energy expenditure in the conditions of a respiratory chamber was accounted for by differences in fat-free body mass (54 and 68%, respectively), whereas differences in the level of spontaneous physical activity accounted for another 19 and 21%.(ABSTRACT TRUNCATED AT 250 WORDS)


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