Accession Number:

AD0285015

Title:

INFLUENCE OF PRIOR COLD EXPOSURE ON PERIPHERAL VASCULAR REACTION ON RABBIT EAR INDUCED BY ABRUPT COLD EXPOSURE

Descriptive Note:

Corporate Author:

KENTUCKY RESEARCH FOUNDATION LEXINGTON

Personal Author(s):

Report Date:

1962-05-01

Pagination or Media Count:

1.0

Abstract:

The influence of prior cold exposure on vasoconstriction induced by abrupt cold exposure was studied in the rabbit ear. Dutch breed rabbits were individually caged outdoors maximum temperature, 21 C minimum, -7 C average, 5.9 C and a control group was kept at 27 C over a five month period. Three groups of New Zealand rabbits were divided to be exposed to 27 C, 5 C, and 5 C dayAND 27 C night temperatures. Rectal, ear and body surface temperatures, heat loss from the ear, and blood flow in the ear were recorded at 27, 23 and 5 C. In general, at 23 and 27 C there was no difference between the groups of rabbits. After one hour exposure to 5 C, outdoor and 5 C groups had a low blood flow to the ear and had no decline in rectal temperature. Other groups, however, had a decrease in rectal temperature and higher ear blood flow. After 12 to 18 hours exposure to 5 C, rectal temperature returned to original values in the 27 C animals blood flow to the ear decreased slightly. Ear blood flow in outdoor and 5 C rabbits increased during this period. Author

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Distribution Statement:

APPROVED FOR PUBLIC RELEASE