Effects of adrenergic blockade on the daily rhythms of body temperature and oxygen consumption of the black-tailed tree rat (Thallomys nigricauda) maintained under different photoperiods

A. Haim, Colleen T. Downs, Jaishree Raman

Research output: Contribution to journalArticlepeer-review

Abstract

(1) Measurements of VO2 and Tb daily rhythms in T. nigricauda were conducted. (2) Three different effects on VO2 and Tb were assessed: alpha and beta blockade, time of the day, and photoperiod regime. (3) Results show that in T. nigricauda, the response of Tb and VO2 differs significantly under the different photoperiod regimes. Rats acclimated to 16L:8D increased Tb values as a response to beta blockade, while alpha blockade caused a decrease in Tb. (4) VO2 values of T. nigricauda acclimated to 11.5L:12.5D responded differently to alpha and beta blockade. It can be assumed that the thermoregulatory responses with beta blockade are through a decrease in heat production, rather than through heat dissipation. However, in the case of alpha blockade, it may be assumed that heat dissipation, through vasodilation, is the cause for the decrease in Tb values.

Original languageEnglish
Pages (from-to)171-177
Number of pages7
JournalJournal of Thermal Biology
Volume26
Issue number3
DOIs
StatePublished - Jun 2001
Externally publishedYes

Keywords

  • Adrenergic blockade
  • Photoperiodicity
  • Thallomys nigricauda

ASJC Scopus subject areas

  • Physiology
  • Biochemistry
  • General Agricultural and Biological Sciences
  • Developmental Biology

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