Figure 6. Sample trace of a Columbian ground squirrel re-warming following exposure to 7% O₂, demonstrating a rapid onset of shivering thermogenesis with normoxia.

During re-warming, T_h (top trace) was transiently warmed to 40°C (black bar), which was the minimum temperature required to offset the post-hypoxic rise in metabolism (, middle trace), which can be readily observed by the rapid, transient changes in neck muscle electromyography (bottom trace).