Energy expenditure is reduced in preobese 2-day Zucker fa/fa rats

B. J. Moore, S. J. Armbruster, B. A. Horwitz, J. S. Stern

Research output: Contribution to journalArticle

Abstract

The rate of oxygen consumption was measured in 2-day Zucker preobese (fa/fa), homozygous (Fa/Fa) lean, and lean rats of unknown genotype (Fa/?) over the ambient temperature range of 26-35° C. Significant differences in body mass were found among the three groups at this early age, the preobese pups having the greatest body mass. To account for body mass differences, the oxygen consumption data were expressed in terms of metabolic body size (ml O2 consumed·g body mass(- 2/3)·h-1). This mass-independent rate of oxygen consumption was significantly lower in the preobese pups than in the homozygous lean (Fa/Fa) pups at both thermoneutral (33-34° C) and cold (26-27° C) ambient temperatures at which, respectively, minimal and maximal rates of oxygen consumption were observed. This reduction in energy expenditures occurs before the establishment of hyperphagia or decreased levels of activity in the preobese pups. These data support the view that attenuated energy expenditure is a significant contributor to the early development of obesity in the Zucker fatty rat and point to the possibility of defective brown adipose tissue-mediated thermogenesis in the preobese pup.

Original languageEnglish (US)
JournalAmerican Journal of Physiology - Regulatory Integrative and Comparative Physiology
Volume18
Issue number2
StatePublished - 1985

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Oxygen Consumption
Energy Metabolism
Zucker Rats
Hyperphagia
Temperature
Brown Adipose Tissue
Thermogenesis
Body Size
Obesity
Genotype

ASJC Scopus subject areas

  • Physiology

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Energy expenditure is reduced in preobese 2-day Zucker fa/fa rats. / Moore, B. J.; Armbruster, S. J.; Horwitz, B. A.; Stern, J. S.

In: American Journal of Physiology - Regulatory Integrative and Comparative Physiology, Vol. 18, No. 2, 1985.

Research output: Contribution to journalArticle

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