| Lowering the temperature of a euthermic subject to a temperature below that normally maintained by homeostasis reduces the metabolic rate, and hence the demand for oxygen and substrates by the tissues. |
| Results Sham animals were euthermic at 6 and 24 h, and their VO2 was similar to baseline values. |
| Torpor bouts alternate with spontaneous arousals were animals revert to euthermic state. |
| Energy requirements when euthermic and torpid, as well as the frequency of arousals, vary strongly with ambient temperature. |
| Sham animals were euthermic at 6 and 24h, and their VO2 was similar to baseline. |
| In black bears, euthermic animals were compared to hibernating animals. |
