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Abstract

Heightened muscle sympathetic nerve activity (MSNA) contributes to impaired vasodilatory capacity and vascular dysfunction associated with aging and cardiovascular disease. The contribution of elevated MSNA to the vasodilatory response during passive leg movement (PLM) is not fully understood. This study tested the hypothesis that elevated MSNA diminishes the vasodilatory response to PLM in healthy young males (n = 11, 25 ± 2 yr). Post exercise circulatory occlusion (PECO) following 2 min of isometric handgrip (HG) exercise performed at 25% (ExPECO 25%) and 40% (ExPECO 40%) maximum voluntary contraction was used to incrementally engage the metaboreceptors and augment MSNA. Control trials were performed without PECO (ExCON 25% and ExCON 40%) to account for changes due to HG exercise. PLM was performed 2 min after exercise and hemodynamics were assessed. MSNA was recorded by microneurography in the peroneal nerve (n = 8). Measures of MSNA (i.e., burst incidences) increased during ExPECO 25% (+15 ± 5 burst/100 bpm) and ExPECO 40% (+22 ± 4 burst/100 bpm) and returned to pre‐HG levels during ExCON trials. Leg vascular conductance (vasodilation) during PLM was reduced by 16% and 44% during ExPECO 25% and ExPECO 40%, respectively. These findings indicate elevated MSNA attenuates the vasodilatory response to PLM and the magnitude of reduction in vasodilation during PLM is graded with the degree of sympathoexcitation.

Details

1009240
Title
Acute sympathetic activation blunts the hyperemic and vasodilatory response to passive leg movement in young healthy males
Author
Hanson, Brady E. 1 ; Lee, Joshua F. 1 ; Garten, Ryan S. 2 ; Barrett‐O'Keefe, Zachary 3 ; Layec, Gwenael 4 ; Ruple, Bradley A. 1 ; Wray, D. Walter 5 ; Richardson, Russell S. 5 ; Trinity, Joel D. 5   VIAFID ORCID Logo 

 Geriatric Research, Education, and Clinical Center, George E. Whalen VA Medical Center, Salt Lake City, Utah, USA, Department of Internal Medicine, Division of Geriatrics, University of Utah, Salt Lake City, Utah, USA 
 Geriatric Research, Education, and Clinical Center, George E. Whalen VA Medical Center, Salt Lake City, Utah, USA, Department of Kinesiology and Health Sciences, Virginia Commonwealth University, Richmond, Virginia, USA 
 Geriatric Research, Education, and Clinical Center, George E. Whalen VA Medical Center, Salt Lake City, Utah, USA, Department of Cardiovascular Medicine, Mayo Clinic, Rochester, Minnesota, USA, Mayo Clinic School of Health Sciences, Mayo Clinic College of Medicine and Science, Mayo Clinic, Rochester, Minnesota, USA 
 Department of Internal Medicine, Division of Geriatrics, University of Utah, Salt Lake City, Utah, USA, School of Health and Kinesiology, University of Nebraska Omaha, Omaha, Nebraska, USA 
 Geriatric Research, Education, and Clinical Center, George E. Whalen VA Medical Center, Salt Lake City, Utah, USA, Department of Internal Medicine, Division of Geriatrics, University of Utah, Salt Lake City, Utah, USA, Department of Nutrition and Integrative Physiology, University of Utah, Salt Lake City, Utah, USA 
Publication title
Volume
13
Issue
5
Publication year
2025
Publication date
Mar 1, 2025
Section
ORIGINAL ARTICLE
Publisher
John Wiley & Sons, Inc.
Place of publication
Oxford
Country of publication
United States
Publication subject
e-ISSN
2051817X
Source type
Scholarly Journal
Language of publication
English
Document type
Journal Article
Publication history
 
 
Online publication date
2025-02-27
Milestone dates
2024-12-05 (manuscriptRevised); 2025-02-27 (publishedOnlineFinalForm); 2024-09-19 (manuscriptReceived); 2024-12-19 (manuscriptAccepted)
Publication history
 
 
   First posting date
27 Feb 2025
ProQuest document ID
3176448355
Document URL
https://www.proquest.com/scholarly-journals/acute-sympathetic-activation-blunts-hyperemic/docview/3176448355/se-2?accountid=208611
Copyright
© 2025. This work is published under http://creativecommons.org/licenses/by/4.0/ (the "License"). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.
Last updated
2025-07-24
Database
ProQuest One Academic