Figure 3. Sample traces of the influence of T_h manipulation on metabolic heat production () and heart rate (f_H) under normoxia (left traces) and hypoxia (7% O₂; right traces) in Columbian ground squirrels.

Traces depict raw data from one squirrel before, during and after 10 min periods of artificial manipulations of T_h below (black bars) and above (hatched bars) normal values. Different scales for normoxic and hypoxic values are shown to demonstrate the influence of T_h manipulation under both oxygen conditions.