Thermogenesis of Brown Fat in Hibernation and Cold Adaptation
107
The total oxygen consumption of the rat and the temperatures of the
6 loci monitored are shown during cold exposure and 25°C (Fig. 1). At 25°C,
temperatures of the interscapular pad (T f ) and the venous outflow (Tv) were
c:: 16 r
E
S
14
c
'2 12
E
c:l
cn 10
c
0
U
<'1
~l
0
m
rt
36 37l
i/ 35
"' ,
,2 34
1
oj
ill
E 33
~
32
31
30i;..l 25
~.3
'" 20
ill
Q.
E 152
g 10·
E
OJ
.c
U
5
':,_,::, ..... °-0-0_0
_ 0 ___ 0 ___ \
o
Brown fat
Vein
Colon
Artery
Inner skin
Outer skin
\0.....
Chamber temperature
°-0-0-0_0_0_0_0
-30 -20 -10 0 10 20 30 40 50 60 70
Time (min)
Fig. 1. Effect of cold exposure on the oxygen consumption of the rat and the
temperature of the 6 sites described in text
quite similar; the arterial temperature (T J however, was generally 0.5 to
1.0 °C higher than Tv and 0-1.0°C higher than Tf • The colonic temperature
(Tb) averaged 1.35 ± .17 °C higher than Tf• Upon exposure of the rat to