Carotid-sinus baroreflex modulation of core and skin temperatures in rats: an open-loop approach.

Content Provider	Semantic Scholar
Author	Zhang, Dongmei Ando, Motonori Yamasaki, Fumiyasu Sato, Takayuki
Copyright Year	2003
Abstract	The neural mechanisms of the thermoregulatory control of core and skin temperatures in response to heat and cold stresses have been well clarified. However, it has been unclear whether baroreceptor reflexes are involved in the control of core and skin temperatures. To investigate how the arterial baroreceptor reflex modulates the body temperatures, we examined the effect of pressure changes of carotid sinus baroreceptors on core and skin temperatures in halothane-anesthetized rats. To open the baroreflex loop and control arterial baroreceptor pressure (BRP), we cut vagal and aortic depressor nerves and isolated carotid sinuses. We sequentially altered BRP in 20-mmHg increments from 60 to 180 mmHg and then in 20-mmHg decrements from 180 to 60 mmHg while measuring systemic arterial pressure (SAP), heart rate (HR), and core blood temperature (T(core)) at the aortic arch and skin temperature (T(skin)) at the tail. In response to the incremental change in BRP by 120 mmHg, SAP, HR, and T(core) fell by 90.3 +/- 5.1 mmHg, 60.3 +/- 10.5 beats min(-1), and 0.18 +/- 0.01 degrees C, respectively. T(skin) rose by 0.84 +/- 0.10 degrees C. The maximum rate of change per unit BRP change was -2.1 +/- 0.2 for SAP, -1.5 +/- 0.4 beats min(-1) mmHg(-1) for HR, -0.003 +/- 0.001 degrees C mmHg(-1) for T(core), and 0.011 +/- 0.002 degrees C mmHg(-1) for T(skin). After the administration of hexamethonium or bretylium, these baroreflexogenic responses were completely abolished. We concluded that T(core) and T(skin) are modulated by the arterial baroreceptor reflex.
File Format	PDF HTM / HTML
Alternate Webpage(s)	https://ir.kochi-u.ac.jp/dspace/bitstream/10126/4189/1/jjphysiol53461.pdf
PubMed reference number	15038844v1
Volume Number	53
Issue Number	6
Journal	The Japanese journal of physiology
Language	English
Access Restriction	Open
Subject Keyword	Aortic arch structure Baroreflex Body Temperature Clarify Halothane Hexamethonium Increment Intracranial Hypertension Nasal sinus Nerve Pressoreceptors Reflex action Sinus - general anatomical term Skin Temperature Structure of carotid sinus bretylium torr
Content Type	Text
Resource Type	Article