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Table 2 Characteristics of body temperature (Tb) rhythms in captive bears during winter dormancy

From: The bear circadian clock doesn’t ‘sleep’ during winter dormancy

  CAPTIVE
  DD All [9] DD Juvenile [5] DD Adult [4] Ambient [1]
Average Tb (°C) 34.4 ± 0.1 34.4 ± 0.1 34.3 ± 0.1 33.7
Min (°C) 31.7 ± 0.5 31.9 ± 0.9 31.5 ± 0.3 30.1
Max (°C) 36.3 ± 0.2 36.1 ± 0.3 36.5 ± 0.4 35.7
Period (h) 23.9 ± 0.09 23.8 ± 0.07a 24 ± 0.07 24
Acrophase (h) 17.8 ± 0.96 19.4 ± 1.8 15.3 ± 1.47 12.6
Strength (%) 66 ± 6 64 ± 10 68 ± 5 53
Variability (h) 1.3 ± 0.07 1.2 ± 0.08 1.5 ± 0.02 1.4
Amplitude (°C) 0.37 ± 0.03 0.4 ± 0 .03 0.4 ± .05 0.4
  1. aSignificantly different from 24 h (one sample t-test)
  2. Numbers of animals are indicated in brackets
  3. Values are means ± SEM