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Am J Physiol Regul Integr Comp Physiol 280: R1341-R1347, 2001;
0363-6119/01 $5.00
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Vol. 280, Issue 5, R1341-R1347, May 2001

Effects of estrogen on thermoregulatory tail vasomotion and heat-escape behavior in freely moving female rats

Takayoshi Hosono1, Xiao-Ming Chen1, Aya Miyatsuji2, Tamae Yoda1, Kyoko Yoshida1, Motoko Yanase-Fujiwara2, and Kazuyuki Kanosue1

1 Department of Physiology, School of Allied Health Sciences, Osaka University Faculty of Medicine, Yamadaoka 1 - 7, Suita, Osaka, 565-0871, and 2 Department of Human Behavior Science, Nara Women's University, Kitauoyahigashimachi, Nara, 630-8506, Japan

Effects of estrogen on thermoregulatory vasomotion and heat-escape behavior were investigated in ovariectomized female rats supplemented with estrogen (replaced estrogen rats) or control saline (low estrogen rats). First, we measured tail temperature of freely moving rats at ambient temperatures (Ta) between 13 and 31°C. Tail temperature of the low estrogen rats was higher than that of the replaced estrogen rats at Ta between 19 and 25°C, indicating that the low estrogen rats exhibit more skin vasodilation than the replaced estrogen rats. There was no significant difference in oxygen consumption and core temperature between the two groups. Second, we analyzed heat-escape behaviors in a hot chamber where rats could obtain cold air by moving in and out of a reward area. The low estrogen rats kept Ta at a lower level than did the replaced estrogen rats. These results imply that the lack of estrogen facilitates heat dissipation both by skin vasodilation and by heat-escape behavior. Ovariectomized rats may mimic climacteric hot flushes not only for autonomic skin vasomotor activity but also for thermoregulatory behavior.

autonomic thermoregulation; behavioral thermoregulation; hot flush


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