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Cited by 138Blood Pressure and Hypertension StudiesHeart Rate Variability and Autonomic ControlCardiovascular and exercise physiology

Sympathoneural and haemodynamic characteristics of young subjects with mild essential hypertension

Floras, John S., Hara, Kazuhiro·1993·Journal of Hypertension
DOI 10.1097/00004872-199306000-00009
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Abstract

OBJECTIVES: Whether muscle sympathetic nerve activity (MSNA) is increased in young subjects with mild essential hypertension has not been firmly established, and the potential haemodynamic correlates of any such increase have not been specifically investigated. The objectives of this study were to quantitate MSNA from the peroneal nerve of young subjects with mild hypertension, to determine the haemodynamic and neurohumoral correlates of sympathetic vasoconstrictor nerve traffic in such subjects, and to document the stability of these observations. DESIGN: Twelve young untrained subjects with mild essential hypertension (mean age 31 years, average clinic blood pressure 151/95 mmHg) and 11 age- and weight-matched normotensive subjects were studied on two sessions, at least 1 month apart, at the same time of day and under identical laboratory conditions. METHODS: Blood pressure (non-invasive), microneurography (MSNA; peroneal nerve), cardiac output and calculated total peripheral resistance (echocardiography and continuous-wave Doppler) and calf blood flow and resistance (plethysmography) were recorded during supine rest and assessed for condition and study order effects by two-way analysis of variance. Reproducibility of MSNA was quantified by the standard deviation of the mean difference (SDD) between the values obtained on the two study days. RESULTS: Muscle sympathetic nerve burst frequency and incidence, calf vascular resistance and cardiac output and index were significantly higher in hypertensive subjects, whereas heart rate, total peripheral resistance, plasma noradrenaline and plasma atrial natriuretic factor concentrations were similar in the two groups. There was no study order effect, in either group, on mean values for MSNA or these haemodynamic variables, but the SDD (day 1-day 2 variation) in muscle sympathetic burst frequency was significantly greater in hypertensive subjects. CONCLUSIONS: Mild essential hypertension in young subjects can be characterized by augmented MSNA as measured from the peroneal nerve, greater between-session variation in sympathetic burst frequency (but no study order effect), and increased calf vascular resistance and cardiac output. These sympathoneural and haemodynamic alterations are potential mechanisms of primary hypertension.

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  • Subsequent studies employing microneurography or measurements of norepinephrine spillover in young adults with borderline or established hypertension have demonstrated marked sympathetic activation.

    “Subsequent studies employing microneurography or measurements of norepinephrine spillover in young adults with borderline or established hypertension have also demonstrated marked sympathetic activation28,32,33.”

    From The Sympathetic Nervous System Alterations in Human Hypertension (2015) · cites this paper as [33]

  • The sympathetic neural outflow is commonly activated also to the heart and skeletal muscle vasculature, but renal sympathetic activation is central to hypertension pathogenesis.

    “The sympathetic neural outflow is commonly activated also to the heart, shown with selective cardiac norepinephrine spillover measurements28, and to the skeletal muscle vasculature, demonstrated with microneurographic nerve traffic recording32,33,38–46, but it is the renal sympathetic activation which is central to hypertension pathogenesis96–97.”

    From The Sympathetic Nervous System Alterations in Human Hypertension (2015) · cites this paper as [33]

  • Patients with hypertension have a greater frequency of MSNA bursts than properly matched normotensive subjects.

    “Despite the difficulty of establishing that every unit within a burst has a vasoconstrictor role, there is a wealth of evidence to suggest that patients with hypertension have a greater frequency of MSNA bursts than properly matched normotensive subjects (15,25–27).”

    From Hypertensive left ventricular hypertrophy: relation to peripheral sympathetic drive (2001) · cites this paper as [27]

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Authors
Floras, J. S., & Hara, K.
Affiliations
Toronto General Hospital (CA)
ORCID
Hara, Kazuhiro
Venue
Journal of Hypertension
Publisher
Ovid Technologies (Wolters Kluwer Health)
Published
1993-06
Volume
11
Issue
6
Pages
647-655
ISSN
0263-6352 (ISSN-L)
DOI
10.1097/00004872-199306000-00009
OpenAlex
W1965263133
Cited by
137
References
0
Citations by year
2025: 2 · 2023: 4 · 2022: 3 · 2021: 2 · 2020: 1 · 2019: 1 · 2018: 6 · 2017: 5 · 2016: 5 · 2015: 9 · 2014: 6 · 2013: 9 · 2012: 4
FWCI
2.30
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Hypertension (publishedVersion)
  • PubMed (publishedVersion)
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
essential hypertension, muscle sympathetic nerve activity, sympathetic nervous system, hemodynamics, peroneal nerve, cardiac output, norepinephrine, atrial natriuretic peptide, reproducibility, young adults
MeSH terms
Adult, Female, Hemodynamics, Humans, Hypertension, Male, Muscles, Sympathetic Nervous System

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