HIBERNATION IN MAMMALS— LYMAN and CHATFIELD 



105 



2.9 



2.5 



log R 



2.0 



1.5 



L|L-L 



.0036 



.0035 



. «;*.•••* 



, '^ 



_l I I ' I I I L. 



1 I J I I I 1 1 1 1 J I 



.0034 .0033 .0032 



W 



Fig. 17. — A plot of the heart rates and body temperatures of 3 completely atropinized hamsters. 



400 



U 



»(i|k*M 



Fig. 18. — Ink writer record of electrocardiogram of a hamster during arousal showing in- 

 creasing rate, shortening of P-R interval and duration of QRS complex, and changes in T 

 wave. Letters indicate components of electrocardiogram. Horizontal line under T wave in each 

 case is isoelectric line. Minor irregularities due to muscle action potentials. 



