Fig. 2From: Influence of exogenous and endogenous estrogen on thermoregulatory responses to mild heat and the interaction with light and dark phasesAbdominal temperature (Tabd) during heat exposure in the ovariectomized (OVX) and OVX + estradiol (E2) groups (open and closed circles, respectively) in the light (a) and dark (c) phases, and in the D and P groups (open and closed squares, respectively) in the light (b) and dark (d) phases. The control data are indicated by solid and dashed lines without symbols (OVX and OVX + E2 groups in a and c, respectively, and D and P groups in b and d, respectively). Differences in Tabd at the same time of day between the heat exposure and control days are presented as H-C (a′–d′ in the light and dark phases in Experiments 1 and 2, respectively). Data are presented as means ± standard error (a and c, n = 7 in each group; b and d, n = 5 in each group). *Significant difference between the OVX and OVX + E2 groups (P < 0.05). †Significant difference between the D and P groups (P < 0.05). §Significant difference between the light and dark phases (P < 0.05). #Significant difference from the value at an ambient temperature (Ta) of 28 °C (P < 0.05). D, control rats in the diestrus phase; P, control rats in the proestrus phaseBack to article page