Cited by 364Heart Rate Variability and Autonomic ControlBlood Pressure and Hypertension StudiesCardiovascular Syncope and Autonomic Disorders

Body Weight Reduction, Sympathetic Nerve Traffic, and Arterial Baroreflex in Obese Normotensive Humans

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Grassi, Guido, Seravalle, Gino, Colombo, Manuela, Bolla, Giambattista, Cattaneo, Bianca M., Cavagnini, Francesco, Mancia, Giuseppe·1998·Circulation

Abstract

Background —Previous studies have shown that sympathetic cardiovascular outflow is increased in obese normotensive subjects and that this increase is associated with a baroreflex impairment. The purpose of this study was to determine whether these abnormalities are irreversible or can be favorably affected by body weight reduction. Methods and Results —In 20 obese normotensive subjects (age, 31.3±1.7 years; body mass index, 37.6±0.9 kg/m 2 , mean±SEM), we measured beat-to-beat arterial blood pressure (Finapres technique), heart rate (ECG), postganglionic muscle sympathetic nerve activity (microneurography at a peroneal nerve), and venous plasma norepinephrine (high-performance liquid chromatography) at rest and during baroreceptor stimulation and deactivation induced by increases and reductions of blood pressure via stepwise intravenous infusions of phenylephrine and nitroprusside. Measurements were repeated in 10 subjects after a 16-week hypocaloric diet with normal sodium content (4600 to 5000 J and 210 mmol NaCl/d) and in the remaining 10 subjects after a 16-week observation period without any reduction in the caloric intake. The hypocaloric diet significantly reduced body mass index, slightly reduced blood pressure, and caused a significant and marked decrease in both muscle sympathetic nerve activity (from 50.0±5.1 to 32.9±4.6 bursts per 100 heart beats, P <.01) and plasma norepinephrine (from 356.2±43 to 258.4±29 pg/mL, P <.05). This was associated with a significant improvement in the sensitivity of the baroreceptor heart rate (+71.5±11%, P <.01) and muscle sympathetic nerve activity (+124.5±22%, P <.001) reflex. Total body glucose uptake also increased significantly (+60.8±12.0%, P <.05), indicating an increase in insulin sensitivity. All variables remained unchanged in subjects not undergoing caloric restriction. Conclusions —In obese normotensive subjects, a reduction in body weight induced by a hypocaloric diet with normal sodium content exerts a marked reduction in sympathetic activity owing to central sympathoinhibition. This can be due to the consequences of an increased insulin sensitivity but also to a restoration of the baroreflex control of the cardiovascular system with weight loss.

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  1. Adehlman ET, Gardner AW, Goran MI, Arciero PJ, Toth MJ, Ades PA, Calles-Escandon J. Sympathetic nervous system activity, body fatness and body fat distribution in young and older males. J Appl Physiol. 1995;78:802-806.
  2. Gordon T, Kannel WB. Obesity and cardiovascular diseases: the Fram- ingham study. Clin Endocrinol Metab. 1976;5:367-375.

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Authors
Grassi, G., Seravalle, G., Colombo, M., Bolla, G., Cattaneo, B. M., Cavagnini, F., & Mancia, G.
Affiliations
University of Milan (IT)
Venue
Circulation
Published
1998-05-26
Volume
97
Issue
20
Pages
2037-2042
ISSN
  • 0009-7322 (ISSN-L)
  • 1524-4539
OpenAlex
W2061713465
Cited by
364
References
39
Citations by year
2026: 2 · 2025: 7 · 2024: 7 · 2023: 12 · 2022: 5 · 2021: 13 · 2020: 9 · 2019: 8 · 2018: 9 · 2017: 14 · 2016: 11 · 2015: 20 · 2014: 19 · 2013: 21 · 2012: 18
FWCI
7.57
Type
journal article
Language
en
Open access
Locations
  • Circulation (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Heart Rate Variability and Autonomic Control
  • Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Blood Pressure and Hypertension Studies
  • Health Sciences › Medicine › Surgery › Cardiovascular Syncope and Autonomic Disorders
Keywords
obesity, normotension, weight loss, hypocaloric diet, muscle sympathetic nerve activity, baroreflex sensitivity, sympathetic nervous system, norepinephrine, baroreceptor stimulation, insulin sensitivity, glucose uptake, caloric restriction, sodium intake, phenylephrine, sodium nitroprusside, blood pressure regulation
MeSH terms
Adult, Blood Pressure, Female, Heart Rate, Humans, Male, Obesity, Pressoreceptors, Reflex, Sympathetic Nervous System, Weight Loss

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