NDLI: Effect of skin temperature on cutaneous vasodilator response to the β-adrenergic agonist isoproterenol

Content Provider	PubMed Central
Author	Hodges, Gary J. Kellogg, Dean L. Johnson, John M.
Copyright Year	2015
Abstract	The vascular response to local skin cooling is dependent in part on a cold-induced translocation of α2C-receptors and an increased α-adrenoreceptor function. To discover whether β-adrenergic function might contribute, we examined whether β-receptor sensitivity to the β-agonist isoproterenol was affected by local skin temperature. In seven healthy volunteers, skin blood flow was measured from the forearm by laser-Doppler flowmetry and blood pressure was measured by finger photoplethysmography. Data were expressed as cutaneous vascular conductance (CVC; laser-Doppler flux/mean arterial blood pressure). Pharmacological agents were administered via intradermal microdialysis. We prepared four skin sites: one site was maintained at a thermoneutral temperature of 34°C (32 ± 10%CVCmax) one site was heated to 39°C (38 ± 11%CVCmax); and two sites were cooled, one to 29°C (22 ± 7%CVCmax) and the other 24°C (16 ± 4%CVCmax). After 20 min at these temperatures to allow stabilization of skin blood flow, isoproterenol was perfused in concentrations of 10, 30, 100, and 300 μM. Each concentration was perfused for 15 min. Relative to the CVC responses to isoproterenol at the thermoneutral skin temperature (34°C) (+21 ± 10%max), low skin temperatures reduced (at 29°C) (+17 ± 6%max) or abolished (at 24°C) (+1 ± 5%max) the vasodilator response, and warm (39°C) skin temperatures enhanced the vasodilator response (+40 ± 9%max) to isoproterenol. These data indicate that β-adrenergic function was influenced by local skin temperature. This finding raises the possibility that a part of the vasoconstrictor response to direct skin cooling could include reduced background β-receptor mediated vasodilation.
Related Links	http://dx.doi.org/10.1152/japplphysiol.01071.2014
Ending Page	903
Page Count	6
Starting Page	898
File Format	PDF
ISSN	15221601
e-ISSN	15221601
Journal	Journal of Applied Physiology
Issue Number	7
Volume Number	118
Language	English
Publisher	American Physiological Society
Publisher Date	2015-04-01
Access Restriction	Open
Rights Holder	American Physiological Society
Subject Keyword	Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Physiology Physiology (medical) Sports Science

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