BIRD ADAPTATIONS 



HAKT: No, not ten times. For example, the pigeon has about 

 the same weight as the rat, and it has about five times the electrical 

 activity. We do not know enough about different species of birds, 

 but this is the trend. It seems there is a much greater electrical 

 activity in birds. 



WEST: I think this will work out better when we put it on a power 

 spectrum basis rather than a simple muscle potential. 



HANNON: It would seem,if youhad agood measure of shivering 

 activity, you should be able to have a 45 relationship between meta- 

 bolic change and shivering change or muscle activity change. 



WEST; Yes, muscle is the source of total heat production and 

 I believe that if the results are standardized on a body surface basis 

 the lines would be close together. 



HANNON; Because your peak microvolts went up considerably 

 faster than your metabolism did. 



HART: Yes, that went up about ten times. 



HANNON; For 100% increase in metabolism, there is a con- 

 siderably greater increase in peak microvolts as a measure of 

 your shivering. 



WEST; I agree, for the smaller species. 



PROSSER; After all, what you are concerned v/i this the energy 

 produced by the chemical reactions in the muscle. Might not a deli- 

 cate vibration detector or something for measuring movement be 

 as effective? Have you tried any of these spring gadgets? 



IRVING: Ballistic cardiograph? 



PROSSER: Yes, like a ballistic cardiograph. 



WEST: We have not tried any, no. 



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