Cited by 106Thermoregulation and physiological responsesCardiovascular and exercise physiologyHeart Rate Variability and Autonomic Control

Mode of neural control mediating rat tail vasodilation during heating

O'Leary, D. S., Johnson, J. M., Taylor, W. F.·1985·Journal of Applied Physiology

Abstract

The purpose of this investigation was to delineate the mode of efferent neural control mediating rat tail vasodilation during body heating. Tail blood flow (venous occlusion plethysmography), tail skin temperature over the ventral vascular bundle, and arterial pressure were measured in Sprague-Dawley rats anesthetized with pentobarbital sodium (45 mg/kg). Three protocols were followed: anesthesia of the lumbar sympathetic chain, bilateral lumbar sympathectomy, and sympathetic nerve stimulation during varying degrees of alpha-adrenergic receptor blockade. Mean tail blood flow and tail vascular conductance (TVC) during body heating were 40.3 +/- 8.7 ml X 100 ml-1 X min-1 and 39.2 +/- 9.2 ml X 100 ml-1 X min-1 X 100 mmHg-1, respectively. Interruption of sympathetic nerve activity by sympathetic nerve anesthetization or sympathectomy during heat stress caused a nonsignificant increase in TVC to 112.7 +/- 1.8 and 121.12 +/- 6.3%, respectively, of the values achieved with body heating. Sympathectomy performed in normothermic animals that had recovered from prior heating caused an increase in TVC to 128.4 +/- 14.0% of the levels achieved during the previous heating period. In addition, sympathetic nerve stimulation after complete alpha-adrenergic receptor blockade failed to produce a vasodilation [control TVC = 10.2 +/- 3.9 vs. TVC during nerve stimulation = 10.4 +/- 3.9 (P greater than 0.05)]. It is concluded that the increase in TVC during body heating occurs solely via a reduction in vasoconstrictor nerve activity.

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Crossref · 10.1152/jappl.1985.59.5.1533

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Authors
O'Leary, D. S., Johnson, J. M., & Taylor, W. F.
Venue
Journal of Applied Physiology
Published
1985-11-01
Volume
59
Issue
5
Pages
1533-1538
ISSN
  • 0161-7567 (ISSN-L)
  • 8750-7587
  • 1522-1601
OpenAlex
W2394598000
Cited by
104
References
0
Citations by year
2026: 1 · 2024: 2 · 2023: 1 · 2021: 3 · 2020: 1 · 2019: 2 · 2018: 5 · 2017: 2 · 2016: 3 · 2015: 4 · 2014: 3 · 2013: 4 · 2012: 1
FWCI
0.76
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Applied Physiology (publishedVersion)
  • PubMed (publishedVersion)
Funders
National Heart, Lung, and Blood Institute (HL20663)
Topics
  • Health Sciences › Medicine › Physiology › Thermoregulation and physiological responses
  • Health Sciences › Medicine › Complementary and alternative medicine › Cardiovascular and exercise physiology
  • Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Heart Rate Variability and Autonomic Control
Keywords
body heating, sympathetic nervous system, lumbar sympathectomy, sympathetic activation, alpha-adrenergic blockade, tail blood flow, heat stress, skin blood flow
MeSH terms
Animals, Body Temperature Regulation, Hot Temperature, Male, Neurons, Efferent, Rats, Inbred Strains, Skin, Sympathetic Nervous System, Tail, Vasodilation, Rats

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