Mechanical and metabolic reflex activation of the sympathetic nervous system in younger adults with metabolic syndrome

Jacqueline Limberg, Barbara Morgan, William Schrage

Research output: Contribution to journalArticle

5 Scopus citations

Abstract

Aim: Based on reports of exaggerated blood pressure responses to whole-body exercise in patients with metabolic syndrome (MetSyn), we tested the hypothesis that MetSyn adults would exhibit augmented sympathetic and pressor responses to mechanoreflex and metaboreflex activation when compared with healthy, age-matched control subjects. Methods: We studied 12 adults with MetSyn (34. ±. 3. years) and 12 healthy control subjects (34. ±. 3. years). Heart rate (HR; ECG), blood pressure (BP; finger photoplethysmography), and MSNA (microneurography of the peroneal nerve) were measured during: (1) static handgrip exercise at 15% of maximal voluntary contraction (MVC), and (2) static handgrip exercise at 30% MVC to fatigue, followed by post-exercise ischemia (PEI). Increases in MSNA, HR, and BP were assessed. Results: During static exercise at both 15 and 30% MVC, increases in MSNA, HR, and BP were not different between groups. MSNA remained significantly elevated from baseline during PEI and responses were not different between groups. Conclusion: Sympathetic and pressor responses to mechanoreflex and metaboreflex activation are not augmented in younger adults with MetSyn.

Original languageEnglish (US)
Pages (from-to)100-105
Number of pages6
JournalAutonomic Neuroscience: Basic and Clinical
Volume183
DOIs
StatePublished - 2014
Externally publishedYes

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Keywords

  • Blood pressure
  • Exercise pressor reflex
  • MSNA
  • Obesity
  • Static exercise

ASJC Scopus subject areas

  • Clinical Neurology
  • Cellular and Molecular Neuroscience
  • Endocrine and Autonomic Systems

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