Daily rhythms of nonshivering thermogenesis in common spiny mice Acomys cahirinus under short and long photoperiods

A. Haim, N. Zisapel

Research output: Contribution to journalArticlepeer-review


Daily rhythms of nonshivering thermogenesis NST were studied in common spiny mice Acomys cahirinus, acclimated to different photoperiod regimes (16L:8D and 8L:16D) at a constant ambient temperature of 26°C. Noradrenaline NA (1.5 mg/kg subcutaneous) was injected at: 06:00, 12:00, 18:00 and 24:00 h (±15 min). NST was measured as the ratio between the maximal oxygen consumption (VO2) as response to NA - VO2NA and VO2 measured at 26°C - VO(2 min). Rectal temperatures T(b)NA and T(b)(min) respectively were recorded at the end of VO2 measurements. Significant variations in T(b)(min), T(b)NA, and NST were revealed, under the two different photoperiod regimes. Significant differences in VO(2 min) NST, T(b)(min) and T(b)NA were also recorded within each photoperiod acclimation group. These results suggest that daily and photoperiod depended variations in the brown adipose tissue activity, presumably emerge from amount of unoccupied receptors or changes in the receptors affinity to NA.

Original languageEnglish
Pages (from-to)455-459
Number of pages5
JournalJournal of Thermal Biology
Issue number5-6
StatePublished - Oct 1999

Bibliographical note

Funding Information:
The authors thank Mr H. Kosik for the maintenance of the common spiny mice colony. This research was supported by the U.S.–Israel Binational Scientific Foundation, Grant No. 91-00248.


  • Arid environment
  • Body temperature
  • Brown adipose tissue
  • Daily rhythms
  • Metabolic rates
  • Nocturnal activity
  • Nonshivering thermogenesis
  • Noradrenaline
  • Oxygen consumption
  • Photoperiod manipulations
  • Rodents
  • Spiny mice

ASJC Scopus subject areas

  • Biochemistry
  • Physiology
  • Agricultural and Biological Sciences (all)
  • Developmental Biology


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