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The influence of hypothalamic temperature and ambient temperature on thermoregulatory mechanisms in the pig
Author(s) -
Baldwin B. A.,
Ingram D. L.
Publication year - 1968
Publication title -
the journal of physiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.802
H-Index - 240
eISSN - 1469-7793
pISSN - 0022-3751
DOI - 10.1113/jphysiol.1968.sp008622
Subject(s) - preoptic area , hypothalamus , thermoregulation , respiration , oxygen , chemistry , respiratory system , endocrinology , medicine , biology , anatomy , organic chemistry
1. Two types of temperature fluctuation have been recorded from the preoptic region of the conscious pig. One, which is associated with arousal or movement, and another, which is related to rhythms in respiration and blood pressure. 2. When the pigs were subjected to infra‐red irradiation at various ambient temperatures it was found that there was no precise temperature of the preoptic region at which the respiratory frequency increased. 3. Local heating of the preoptic region was effective in increasing the respiratory frequency only when the ambient temperature was above 30° C. 4. Even when both the peripheral temperature and central temperatures were increased there was a delay of several minutes before the onset of panting. 5. Cooling the preoptic region of the hypothalamus prevented the onset of panting in a hot environment, and reduced respiratory frequency in an animal which was already panting. 6. Oxygen consumption was reduced in a cold environment when the preoptic region was warmed, and increased when it was cooled. No increase in oxygen consumption occurred when the hypothalamus was cooled in a hot environment.