Effects of food deprivation on daily changes in body temperature and behavioral thermoregulation in rats

Tamae Yoda, Larry I. Crawshaw, Kyoko Yoshida, Liu Su, Takayoshi Hosono, Osamu Shido, Sotaro Sakurada, Yutaka Fukuda, Kazuyuki Kanosue

Research output: Contribution to journalArticle

61 Citations (Scopus)

Abstract

Homeothermic animals regulate body temperature (T(b)) by using both autonomic and behavioral mechanisms. In the latter process, animals seek out cooler or warmer places when they are exposed to excessively hot or cold environments. Thermoregulation is affected by the state of energy reserves in the body. In the present study, we examine the effects of 4-day food deprivation on circadian changes in T(b) and on cold-escape and heat-escape behaviors in rats. Continuous measurement of T(b) during food deprivation indicated that the peak T(b) amplitude was not different from baseline values, but the trough amplitude continuously decreased after the onset of food deprivation. Cold-escape behavior was facilitated by food deprivation, whereas heat-escape behavior was unchanged. After the termination of food deprivation, the lowered T(b) returned to normal on the first day. However, cold-escape behavior was still facilitated on the third day after food reintroduction. Autonomic and behavioral thermoregulatory effectors are modulated in the face of food shortage so as to maintain optimal performance during the active period, whereas increasing energy conservation occurs during the quiescent phase.

Original languageEnglish
Pages (from-to)R134-R139
JournalAmerican Journal of Physiology - Regulatory Integrative and Comparative Physiology
Volume278
Issue number1 47-1
DOIs
Publication statusPublished - 2000 Jan

Keywords

  • Cold escape
  • Heat escape
  • Operant behavior

ASJC Scopus subject areas

  • Physiology
  • Physiology (medical)

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