Home > Iowa Academy of Science > Journals & Newsletters > Proceedings of the Iowa Academy of Science > Volume 68 (1961) > Annual Issue
Document Type
Research
Abstract
A day-night rhythm of body temperature in the golden hamster (Mesocricetus auratus) is described, showing a maximum of about 37.6°C in the night-animal and a minimum which is about l.3°C lower in the day-animal. The day-night difference is still present after forced exercise, indicating that the temperature-regulating mechanism, rather than muscular activity alone, accounts in part for the observed day-night rhythm of body temperature in the hamster. A day-night rhythm of heart rate was also found with a resting midnight level of 457 beats/min, and a resting noon minimum level which is about 45 beats/min lower. Apparently the hamster has a day-night cardiovascular setting as found in many other mammals. The heart rates decreased after forced exercise, and there was no evidence of the day-night heart rhythm during the period of recovery which extended for several hours.
Publication Date
1961
Journal Title
Proceedings of the Iowa Academy of Science
Volume
68
Issue
1
First Page
594
Last Page
602
Copyright
©1961 Iowa Academy of Science, Inc.
Language
en
File Format
application/pdf
Recommended Citation
Folk, G. Edgar Jr.; Schellinger, Richard R.; and Snyder, Delbert
(1961)
"Day-Night Changes After Exercise in Body Temperatures and Heart Rates of Hamsters,"
Proceedings of the Iowa Academy of Science, 68(1), 594-602.
Available at:
https://scholarworks.uni.edu/pias/vol68/iss1/83