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Fig. 2. (A) Entry into torpor in a dormouse (#R4S, BW=120 g) at 15°C
Ta. Body temperature (Tb, black filled
circles), metabolic rate
(
O2, solid black
line) and heart rate (fH, thick solid black line) were
recorded simultaneously. The different phases of entries into torpor are shown
in a 4 day sample recording, broken after the first day, from 1–5
August, 2000. Four different phases were defined: phase I (P I) as a resting
phase, phase II as the pre-torpor phase, phase III was defined as the period
lasting from the initial peak through 90% of transition towards values reached
in steady state of torpor. Dotted lines indicate beginning and end of single
phases. The end of P III is determined by 90% reduction value of RMR during P
I. The 90% decrease time of fV, fH and
Tb are calculated separately. Phase IV is defined as the
phase of lethargy. (B) The same entry into torpor as in Fig. 2A, but
additionally the ventilation frequency (fV, gray circles)
and the oxygen pulse for ventilation are shown (compare
Fig. 5B). Note the high
ventilatory frequency and the simultaneous low oxygen pulse occuring prior to
entrance into torpor.
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