Cited by 195Blood Pressure and Hypertension StudiesHeart Rate Variability and Autonomic ControlCardiovascular and exercise physiology

Differing Pattern of Sympathoexcitation in Normal-Weight and Obesity-Related Hypertension

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Lambert, Elisabeth, Straznicky, Nora, Schlaich, Markus, Esler, Murray, Dawood, Tye, Hotchkin, Elodie, Lambert, Gavin·2007·Hypertension

Abstract

Hypertension in normal-weight and obese individuals is characterized by activation of the sympathetic nervous system. Measurement of spillover of the sympathetic transmitter, norepinephrine, to plasma indicates that the regional pattern of sympathetic activation in the 2 “variants” of essential hypertension differs, excluding the heart in obesity-related hypertension. Whether sympathetic nerve firing characteristics also differ is unknown. We studied multiunit and single fiber sympathetic nerve firing properties in patients with normal-weight hypertension and obesity-related hypertension, comparing these with nerve characteristics in normal-weight and obese people with normal blood pressure. Both normal-weight hypertensive (n=10) and obese hypertensive (n=14) patients had increased total multiunit muscle sympathetic nerve activity compared with the normal-weight (n=11) and obese (n=11) people with normal blood pressure (65±4 versus 47±6 bursts per 100 heartbeats, P <0.01 in the normal-weight groups and 68±4 versus 53±3 bursts per 100 beats, P <0.01 in the obese groups). Sympathetic activation in normal-weight hypertension was characterized by increased firing rate of single vasoconstrictor fibers (70±8 versus 28±3 spikes per 100 beats; P <0.001), increased firing probability per heartbeat (39±3% versus 20±3%; P <0.001), and higher incidence of multiple spikes per heartbeat (30±4% versus 17±4%; P <0.05). Sympathetic activation in obesity-related hypertension differed, involving recruitment of previously silent fibers, which fired at a normal rate. The pattern of sympathetic activation in normal-weight and obesity-related hypertension differs in terms of both the firing characteristics of individual sympathetic fibers and the sympathetic outflows involved. The underlying central nervous system mechanism and the adverse consequences of the 2 modes of sympathetic activation may differ.

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Crossref · 10.1161/hypertensionaha.107.094649

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  • In lean hypertensive patients, the increase in sympathetic activity evident in multiunit burst number and size is because of an increase in the firing rate of individual single fibers and to the common presence of firing salvos, multiple firings in a single cardiac cycle.

    “In lean hypertensive patients, the increase in sympathetic activity evident in multiunit burst number and size is because of an increase in the firing rate of individual single fibers, and to the common presence of firing salvos, multiple firings in a single cardiac cycle 31 (Figure 2).”
  • Multiunit sympathetic nerve firing is similarly increased in both lean and obese hypertensive patients.

    “That multiunit sympathetic nerve firing is similarly increased in both lean and obese hypertensive patients is well known.31,32”
  • With the coexistence of impaired norepinephrine reuptake with firing salvos in normal-weight essential hypertension and in depressive illness and panic disorder, there is evidence of cardiac risk, even in panic disorder.

    “Conversely, with the coexistence of impaired norepinephrine reuptake with firing salvos in normal-weight essential hypertension 31,[33][34][35][36] and in depressive illness 42,51,79 and panic disorder, 51,79,80 there is evidence of cardiac risk, 84 even in panic disorder.[85][86][87]”
  • In obese hypertensive humans, there is enhanced muscle sympathetic nerve activity, but the neurophysiologic basis of this increase is different in obese vs lean hypertensive subjects.

    “In obese hypertensive humans, there is enhanced muscle sympathetic nerve activity, but the neurophysiologic basis of this increase is different in obese vs lean hypertensive subjects67.”
  • In lean hypertensive patients, the increased sympathetic activity is related to increased firing frequency of single nerve fibers.

    “In lean hypertensive patients, the increased sympathetic activity is related to increased firing frequency of single nerve fibers.”

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Authors
Lambert, E., Straznicky, N., Schlaich, M., Esler, M., Dawood, T., Hotchkin, E., & Lambert, G.
Affiliations
  • From the Human Neurotransmitters Laboratory, Baker Heart Research Institute, Melbourne, Victoria, Australia.
  • Baker Heart and Diabetes Institute (AU)
Venue
Hypertension
Published
2007-11
Volume
50
Issue
5
Pages
862-868
ISSN
  • 0194-911X (ISSN-L)
  • 1524-4563
OpenAlex
W2168053032
Cited by
195
References
41
Citations by year
2026: 2 · 2025: 3 · 2024: 6 · 2023: 4 · 2022: 3 · 2021: 8 · 2020: 9 · 2019: 14 · 2018: 6 · 2017: 14 · 2016: 17 · 2015: 14 · 2014: 12 · 2013: 11 · 2012: 13
FWCI
9.57
Type
journal article
Language
en
Open access
Locations
  • Hypertension (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Diabetes Australia
  • Medical Research Council
  • National Health and Medical Research Council (225108)
Topics
  • Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Blood Pressure and Hypertension Studies
  • Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Heart Rate Variability and Autonomic Control
  • Health Sciences › Medicine › Complementary and alternative medicine › Cardiovascular and exercise physiology
Keywords
obesity-related hypertension, sympathetic activation, muscle sympathetic nerve activity, norepinephrine spillover, firing probability, sympathetic outflow, essential hypertension
MeSH terms
Action Potentials, Adult, Aged, Blood Pressure, Electrocardiography, Electrophysiology, Female, Heart Rate, Humans, Hypertension, Male, Microelectrodes, Middle Aged, Obesity, Peroneal Nerve, Sympathetic Nervous System, Thinness, Sympathetic Fibers, Postganglionic

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