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Table 2 Average measurements of the whole day and the light and dark phases and the circadian amplitude on the control day

From: Influence of exogenous and endogenous estrogen on thermoregulatory responses to mild heat and the interaction with light and dark phases

Group Average of the whole day Average of the light phase Average of the dark phase Amplitude
Tabd, °C
 OVX 37.5 ± 0.1 37.3 ± 0.1 37.8 ± 0.1§ 0.6 ± 0.1
 OVX + E2 37.6 ± 0.1 37.3 ± 0.1 37.9 ± 0.1§ 0.6 ± 0.1
 D 37.8 ± 0.1 37.4 ± 0.1 37.9 ± 0.1§ 0.5 ± 0.1
 P 37.6 ± 0.1 37.3 ± 0.1 37.9 ± 0.1§ 0.6 ± 0.1
Ttail, °C
 OVX 34.0 ± 0.6 34.4 ± 0.4 33.5 ± 0.7 0.9 ± 0.3
 OVX + E2 32.3 ± 0.7 33.8 ± 0.5 29.7 ± 0.8*§ 3.4 ± 0.7*
 D 34.6 ± 0.3 35.3 ± 0.2 34.0 ± 0.4 1.3 ± 0.2
 P 33.7 ± 0.3 34.8 ± 0.3 32.7 ± 0.3†§ 2.1 ± 0.1
Spontaneous activity, au
 OVX 2.0 ± 0.2 1.1 ± 0.2 2.9 ± 0.4§ 1.8 ± 0.4
 OVX + E2 2.4 ± 0.4 1.4 ± 0.3 3.3 ± 0.5§ 1.8 ± 0.3
 D 1.5 ± 0.4 1.0 ± 0.4 2.7 ± 0.3§ 1.8 ± 0.2
 P 2.2 ± 0.2 1.2 ± 0.2 2.9 ± 0.4§ 1.8 ± 0.3
\(\dot{\text {V}}\)O2, ml min−1 kg bw−0.75
 OVX 15.1 ± 0.3 13.6 ± 0.6 16.5 ± 0.9§ 3.3 ± 1.3
 OVX + E2 14.5 ± 0.6 12.1 ± 0.9 16.8 ± 0.4§ 4.7 ± 0.7
 D 13.3 ± 0.4 12.4 ± 0.7 14.1 ± 0.7§ 1.9 ± 0.9
 P 14.7 ± 0.3 14.0 ± 0.4 15.4 ± 0.7§ 1.6 ± 0.9
  1. Data are presented as means ± standard error
  2. OVX, ovariectomized; E2, estradiol; D, control rats in the diestrus phase; P, control rats in the proestrus phase; Ta, ambient temperature; Tabd, abdominal temperature; Ttail, tail skin temperature; bw, body weight; au, arbitrary unit
  3. * Significant difference from the value in the OVX group, P < 0.05
  4. Significant difference from the value in the D group, P < 0.05
  5. § Significant difference between the light and dark phases, P < 0.05