Sustained effects of repeated restraint stress on muscle and adipocyte metabolism in high-fat-fed rats

Jun Zhou, Xiaolang Yan, Donna H. Ryan, Ruth B.S. Harris

Research output: Contribution to journalArticle

24 Scopus citations

Abstract

Repeated restraint stress 3 h/day for 3 days in rats causes a temporary hypophagia but a sustained weight loss. We investigated whether poststress changes in peripheral tissue metabolism contributed to these responses. One day after the last restraint, insulin sensitivity, measured by oral glucose tolerance test, was improved in restrained rats. Restraint and pair-fed rats weighed less than controls, but body fat content was the same in all groups. Muscle glucose uptake, measured in vitro, was not changed by treatment, whereas in vitro adipocyte glucose uptake was substantially inhibited only in restrained rats. Adipocytes from restrained rats had elevated rates of fatty acid oxidation but not fatty acid esterification, indicating a shift in energy supply from glucose to fatty acids. Five days after the last restraint, the reduced weight of restrained and pair-fed rats resulted from loss of both lean and fat tissue. These results demonstrate that restraint caused sustained, tissue-specific changes in metabolism that may contribute to changes in body composition and body weight of the rats.

Original languageEnglish (US)
JournalAmerican Journal of Physiology - Regulatory Integrative and Comparative Physiology
Volume277
Issue number3 46-3
StatePublished - Sep 1 1999
Externally publishedYes

Keywords

  • Body composition
  • Fatty acid oxidation
  • Glucose tolerance
  • Glucose transport

ASJC Scopus subject areas

  • Physiology
  • Physiology (medical)

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