Table 1.

Physiological and biochemical changes in mus musculus in natural torpor and adenosine-induced hypothermia.

	Natural torpor	Adenosine-induced hypothermia
Heart rate during entrance to hypothermia	600 bpm → 100 bpm in 1 h	600 bpm → 200 bpm in 8 h
Heart rate during arousal from hypothermia	100 bpm → 600 bpm in 30 min	200 bpm → 600 bpm in 90 min
Asystoles	Periodic and frequent skipped beats	Infrequent asystoles with extended interbeat intervals
Rate of heat loss during entrance	0.2°C per minute	5× faster
Rate of heat gain during arousal	0.4°C per minute	2× slower
Circulating lactate	Low	Low
Shivering	Periodically	None
c-Fos expression in the heart and liver	No change from normal	80–100 fold induction

Special thanks to Francesca Barradale for her drawings used in the table.