Accession Number : AD0285015

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

Corporate Author : KENTUCKY RESEARCH FOUNDATION LEXINGTON

Personal Author(s) : HONDA,N. ; JUDY,W.V. ; CARLSON,L.D.

Report Date : MAY 1962

Pagination or Media Count : 1

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)

Descriptors :   *BLOOD VESSELS, *BODY TEMPERATURE, *EXPOSURE(PHYSIOLOGY), EAR, LABORATORY ANIMALS, RABBITS

Distribution Statement : APPROVED FOR PUBLIC RELEASE