Figure 4.

Average change in relative core body temperature (left) and brain temperature (right) in response to cold exposure sampled per 5 min (n = 2). The red line denotes the baseline condition with ambient temperatures of 24 °C. The blue line denotes nightly cold exposure and the first 12 h of recovery during the light phase, where ambient temperature was restored to 24 °C. Cold exposure resulted in an average reduction of 0.9 ± 0.19 °C during the last 6 h of the cold exposure night compared to the baseline for both temperature correlates (lm model, p < 0.001). Data are plotted as the average ± SEM (shaded areas around the lines). The grey and yellow bar on top reflects the 12:12 light-dark cycle.