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Fig. 2 | BMC Veterinary Research

Fig. 2

From: A refined method to monitor arousal from hibernation in the European hamster

Fig. 2

Brown adipose tissue re-warming precedes core body temperature increases. a Core body temperature (Tb – iButton, diamond symbol) and BAT temperature recordings (TBAT - IPTT tag, circle symbol) from 5 individuals during an arousal from torpor (each individual represented by a different colour). The mean ventilation frequency (VF) at each quartile of arousal, as defined by a non-linear curve fit for all individuals, is indicated by black arrows. b BAT temperature recording corresponding to onset of BAT adjacent skeletal muscle shivering. Observations and recordings were done in 9 separate arousal events in 5 different animals. c Five arousal events synchronised in time at 23.5 °C showing the modelled 1st and 2nd derivatives. First derivate graph describes rewarming rate (RWR) and second derivate graph the rewarming acceleration. Mean maximum rewarming rate (RWRmax, best fit linear regression) is similar for both Tb and TBAT at 21.0 Ch − 1 (CI: 15.4–26.5 °Ch − 1 ) and 20.9 °Ch − 1 (CI: 20.3–21.4 °Ch − 1 ), respectively

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