+ Site Statistics
+ Search Articles
+ PDF Full Text Service
How our service works
Request PDF Full Text
+ Follow Us
Follow on Facebook
Follow on Twitter
Follow on LinkedIn
+ Subscribe to Site Feeds
Most Shared
PDF Full Text
+ Translate
+ Recently Requested

The influence of hypothalamic temperature and ambient temperature on thermoregulatory mechanisms in the pig



The influence of hypothalamic temperature and ambient temperature on thermoregulatory mechanisms in the pig



Journal of Physiology 198(3): 517-529



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 degrees 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.

Please choose payment method:






(PDF emailed within 0-6 h: $19.90)

Accession: 006697826

Download citation: RISBibTeXText

PMID: 5685285

DOI: 10.1113/jphysiol.1968.sp008622


Related references

Influence of thermoregulatory vasomotion and ambient temperature variation on the accuracy of core-temperature estimates by cutaneous liquid-crystal thermometers. Anesthesiology 86(3): 603-612, 1997

The influence of hypothalamic temperature on some thermoregulatory effects of hypothalamic injections of norepinephrine. Pharmacology, Biochemistry, and Behavior 5(6): 713-716, 1976

thermoregulatory effects of intraventricular injection of noradrenaline in the mouse and the influence of ambient temperature. Journal of Physiology 223(3): 619-631, 1972

Effect of ambient temperature on the ability of mu-, kappa- and delta-selective opioid agonists to modulate thermoregulatory mechanisms in the rat. Journal of Pharmacology and Experimental Therapeutics 268(2): 847-855, 1994

Body temperature regulation in desert rat Regional distribution of cyclo , a thermoregulatory brain peptide, at high ambient temperature. Journal of Investigative Medicine 43(SUPPL 1): 9A, 1995

The influence of ambient temperature on thermoregulatory responses to intraventricularly injected monoamines in sheep, goats and rabbits. Experientia 25(6): 608-609, 1969

The influence of high ambient temperature on thermoregulatory response to intrahypothalamic injections of noradrenaline and serotonin in the pigeon. Pflugers Archiv 377(1): 51-55, 1978

Influence of ambient temperature on the thermoregulatory responses to 5-hydroxytryptamine, noradrenaline and acetylcholine injected into the lateral cerebral ventricles of sheep, goats and rabbits. Journal of Physiology 212(2): 377-392, 1971

Effects of hypothalamic temperature and ambient temperature on sleep states in the kangaroo rat. Federation Proceedings 35(3): 559, 1976

Schedule-induced polydipsia: effect of water temperature, ambient temperature, and hypothalamic cooling. Journal of Comparative and Physiological Psychology 83(2): 208-220, 1973

Temperature-sensitive neurons in preoptic-anterior hypothalamic region: effects of increasing ambient temperature. American Journal of Physiology 215(5): 1151-1159, 1968

The influence of ambient temperature on preoptic anterior hypothalamic thermo sensitivity in the rabbit. Physiology Canada 4(4): 212, 1973

Temperature sensitive neurons in preoptic anterior hypothalamic region effects of increasing ambient temperature urethan cent depress cat. American Journal Of Physiology: 1151-1159, 1968

The influence of ambient temperature and hypothalamic lesions on the disappearance rates of thyroxine-I-131 in the Japanese quail. Life Sciences 5(4): 309-315, 1966

Effect of different ambient temperature and lipopolysaccharide administration on the circadian rhythm of rectal temperature and hypothalamic PGE2 production in aged male rats. Mechanisms Of Ageing & Development. 85(2-3): 65-72, 1995