Tail position affects the body temperature of rats during cold exposure in a low-energy state.
Rats place their tails underneath their body trunks when cold (tail-hiding behavior). The aim of the present study was to determine whether this behavior is necessary to maintain body temperature. Male Wistar rats were divided into 'fed' and '42-h fasting' groups. A one-piece tail holder (8.4 cm in length) that prevented the tail-hiding behavior or a three-piece tail holder (2.8 cm in length) that allowed for the tail-hiding behavior was attached to the tails of the rats. The rats were exposed to 27°C for 180 min or to 20°C for 90 min followed by 15°C for 90 min with continuous body temperature and oxygen consumption measurements. Body temperature decreased by -1.0 ± 0.1°C at 15°C only in the rats that prevented tail-hiding behavior of the 42-h fasting group, and oxygen consumption increased at 15°C in all animals. Oxygen consumption was not different between the rats that prevented tail-hiding behavior and the rats that allowed the behavior in the fed and 42-h fasting groups under ambient conditions. These results show that the tail-hiding behavior is involved in thermoregulation in the cold in fasting rats.
Laboratory of Integrative Physiology (Body Temperature and Fluid Laboratory), Health and Welfare, Faculty of Human Sciences, Waseda University, 2-579-15 Mikajima, Tokorozawa, Saitama, 359-1192, Japan.
Yuki
Y
Uchida
Ken
K
Tokizawa
Mayumi
M
Nakamura
Cheng-Hsien
CH
Lin
Kei
K
Nagashima
D000818:Animals; D001831:Body Temperature / Q000502:physiology*; D001833:Body Temperature Regulation / Q000502:physiology*; D003080:Cold Temperature / Q000009:adverse effects*; D005215:Fasting / Q000502:physiology*; D008297:Male; D011187:Posture / Q000502:physiology*; D051381:Rats; D017208:Rats, Wistar; D013623:Tail / Q000098:blood supply / Q000502:physiology*