| Literature DB >> 17948068 |
Jenifer C Utz1, Vanja Velickovska, Anastacia Shmereva, Frank van Breukelen.
Abstract
During hibernation animals oscillate from near ambient (T(a)) to euthermic body temperatures (T(b)). As animals arouse, the rate of rewarming (RRW) might be expected to simply increase as a function of time. We monitored the T(b) of golden-mantled ground squirrels (Spermophilus lateralis) housed at 4, 8, 12, and 16 degrees C during natural arousals. The maximum RRW, the time required to reach a maximum RRW, and the relative time index all demonstrated negative relationships with T(a). The T(b) corresponding to maximal RRW demonstrated a positive relationship with T(a). Squirrels reached maximal RRW when they had generated 30 to 40% of the heat required to reach a euthermic T(b). These data suggest that arousal is more constrained than expected and that both time and temperature influence the RRW.Entities:
Year: 2007 PMID： 17948068 PMCID： PMC2034309 DOI： 10.1016/j.jtherbio.2007.02.002
Source DB: PubMed Journal: J Therm Biol ISSN： 0306-4565 Impact factor: 2.902