INFLUENCE OF PRIOR COLD EXPOSURE ON PERIPHERAL VASCULAR REACTION ON RABBIT EAR INDUCED BY ABRUPT COLD EXPOSURE
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1962
- Accession Number
- AD0285015
Entities
People
- L.d. Carlson
- N. Honda
- W.v. Judy