Artery Research

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Volume 16, Issue C, December 2016, Pages 67 - 67

8.8 SYMPATHETIC VASOCONSTRICTOR RESPONSE TO LOWER BODY NEGATIVE PRESSURE IN YOUNG OBESE ADULTS: THE PRELIMINARY FINDING

Authors
Kanokwan Bunsawat, Georgios Grigoriadis, Bo Fernhall, Tracy Baynard
University of Illinois at Chicago, Chicago, USA
Available Online 24 November 2016.
DOI
10.1016/j.artres.2016.10.064How to use a DOI?
Abstract

Background: Elevations in muscle sympathetic nerve activity (MSNA) and sympathetic vasoconstrictor responsiveness to sympathoexcitation are associated with increased cardiovascular risks, which affect hemodynamics, and have been reported in obese adults with metabolic syndrome (1–3). It remains unclear whether this observation may also be present in young metabolically healthy obese adults.

Purpose: To compare sympathetic vasoconstrictor and hemodynamic responsiveness to lower body negative pressure (LBNP, −20 mmHg) in young normal-weight (NW) vs. obese (OB) adults.

Method: Eleven NW (female=6; 25±2 yrs; 22.4±0.6 kg/m2) and 13 OB adults (female=6; 27±1 yrs; 32.7±0.6 kg/m2) underwent 2-min of LBNP in the supine position. Ultrasonography [brachial diameter, forearm blood flow (FBF), forearm vascular conductance (FVC)], MSNA [burst frequency, total MSNA, sympathetic vascular transduction], and beat-to-beat hemodynamics [heart rate (HR), mean arterial pressure (MAP), total peripheral resistance (TPR), cardiac output (CO), stroke volume (SV), systemic compliance (SC)] were reported. FBF and FVC were normalized to lean forearm mass, and TPR, CO, SV, and SC to body surface area.

Results: Baseline MAP was lower in OB (P<0.05). In response to LBNP, normalized FBF, FVC, SV, CO, and SC decreased whereas TPR increased similarly in both groups (P<0.05). Brachial diameter and HR did not change in both groups. MAP decreased similarly by ∼2–4 mmHg, but the values were lower in the OB group (P<0.05). Burst frequency, total MSNA, and sympathetic vascular transduction increased similarly in both groups (P<0.05).

Conclusion: Young metabolically healthy obese adults did not exhibit altered sympathetic vasoconstrictor responsiveness under resting condition.

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This is an open access article distributed under the CC BY-NC license.

References

1.NE Straznicky, MT Grima, CI Sari, N Eikelis, EA Lambert, PJ Nestel, et al., Neuroadrenergic dysfunction along the diabetes continuum: a comparative study in obese metabolic syndrome subjects, Diabetes, Vol. 61, No. 10, 2012, pp. 2506-16.
2.RJ Huggett, J Burns, AF Mackintosh, and DA Mary, Sympathetic neural activation in nondiabetic metabolic syndrome and its further augmentation by hypertension, Hypertension, Vol. 44, No. 6, 2004, pp. 847-52.
3.FH Kuniyoshi, IC Trombetta, LT Batalha, MU Rondon, MC Laterza, MM Gowdak, et al., Abnormal neurovascular control during sympathoexcitation in obesity, Obesity research, Vol. 11, No. 11, 2003, pp. 1411-9.
<Previous Article In Issue
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Journal
Artery Research
Volume-Issue
16 - C
Pages
67 - 67
Publication Date
2016/11/24
ISSN (Online)
1876-4401
ISSN (Print)
1872-9312
DOI
10.1016/j.artres.2016.10.064How to use a DOI?
Open Access
This is an open access article distributed under the CC BY-NC license.

Cite this article

risenwbib
TY  - JOUR
AU  - Kanokwan Bunsawat
AU  - Georgios Grigoriadis
AU  - Bo Fernhall
AU  - Tracy Baynard
PY  - 2016
DA  - 2016/11/24
TI  - 8.8 SYMPATHETIC VASOCONSTRICTOR RESPONSE TO LOWER BODY NEGATIVE PRESSURE IN YOUNG OBESE ADULTS: THE PRELIMINARY FINDING
JO  - Artery Research
SP  - 67
EP  - 67
VL  - 16
IS  - C
SN  - 1876-4401
UR  - https://doi.org/10.1016/j.artres.2016.10.064
DO  - 10.1016/j.artres.2016.10.064
ID  - Bunsawat2016
ER  -