Figure 1. Time course of arousal from hibernation in four freely moving hamsters.

The profile has been presented so that for all simultaneously measured parameters, zero time on the x-axes coincides with rectal temperature reaching 15 °C. This is the approximate time of maximum metabolic rate in hamsters arousing in an ambient temperature of 4 °C. A, brown adipose tissue (BAT; left trace), cortex (Brain, dotted line), cheek pouch (Mouth, partial trace) and rectal (right trace) temperatures. B, respiratory rate (RR; upper trace), CO₂ production (CO₂; middle trace) and O₂ consumption (O₂; lower trace). Data are presented as means ±s.e.m.