Artery Research

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Volume 6, Issue 2, June 2012, Pages 78 - 84

Reproducibility of cardiac output derived by impedance cardiography during postural changes and exercise

Authors
Martin G. Schultza, Rachel E.D. Climiea, Sonja B. Nikolica, Kiran D. Ahujab, James E. Sharmana, *
aMenzies Research Institute Tasmania, University of Tasmania, Hobart, Tasmania, Private Bag 23, Hobart, 7000, Australia
bSchool of Human Life Science, University of Tasmania, Launceston, Tasmania, Australia
*Corresponding author. Tel.: +61 3 6226 4709; fax: +61 3 6226 7704. E-mail address: James.Sharman@menzies.utas.edu.au (J.E. Sharman).
Corresponding Author
James E. Sharman
Received 12 December 2011, Revised 3 February 2012, Accepted 3 February 2012, Available Online 26 February 2012.
DOI
10.1016/j.artres.2012.02.001How to use a DOI?
Keywords
Haemodynamics; Cardiac output; Impedance cardiography; Blood pressure; Reproducibility
Abstract

Background: Evaluation of cardiac output (CO) and other haemodynamic parameters may aid in understanding factors involved in arterial blood pressure (BP) changes with exercise and postural stress. Impedance cardiography offers a rapid, non-invasive means to acquire this information, however there is limited data assessing the reproducibility of this technique during haemodynamic perturbation. This study aimed to assess reproducibility of CO and other haemodynamic parameters derived from impedance cardiography during exercise and in different postures.

Methods: 51 participants (mean age 57 ± 9 years, 57% male) had CO and other haemodynamic variables (including end diastolic volume, left ventricular work, ejection fraction and systemic vascular resistance) measured via impedance cardiography (Physio Flow) at two visits separated by 12 ± 7 days. Measures were recorded at rest in three postures (supine, seated and standing), during upright cycle ergometry at a fixed workload (40 W), and also during steady state exercise at an intensity of 60% and 70% of age-predicted maximum heart rate (HRmax).

Results: CO reproducibility was assessed over a wide range (5.27 ± 1.00–12.09 ± 2.02 l/min). There was good agreement between CO measured at each visit in all postures and exercise conditions (intra-class correlation coefficient [ICC] range 0.729–0.888, P < 0.05 for all) with a small difference between visits (mean difference 0.06 ± 1.10 l/min). All other haemodynamic variables showed good agreement between visits (ICC range 0.714–0.970, P < 0.05 for all).

Conclusions: Non-invasive impedance cardiography provides an acceptably reproducible means to evaluate CO and other haemodynamic variables relevant to arterial BP regulation during different postures and light-to-moderate intensity exercise.

Copyright
© 2012 Association for Research into Arterial Structure and Physiology. Published by Elsevier B.V. All rights reserved.
Open Access
This is an open access article distributed under the CC BY-NC license.

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<Previous Article In Issue
Next Article In Issue>
Journal
Artery Research
Volume-Issue
6 - 2
Pages
78 - 84
Publication Date
2012/02/26
ISSN (Online)
1876-4401
ISSN (Print)
1872-9312
DOI
10.1016/j.artres.2012.02.001How to use a DOI?
Copyright
© 2012 Association for Research into Arterial Structure and Physiology. Published by Elsevier B.V. All rights reserved.
Open Access
This is an open access article distributed under the CC BY-NC license.

Cite this article

risenwbib
TY  - JOUR
AU  - Martin G. Schultz
AU  - Rachel E.D. Climie
AU  - Sonja B. Nikolic
AU  - Kiran D. Ahuja
AU  - James E. Sharman
PY  - 2012
DA  - 2012/02/26
TI  - Reproducibility of cardiac output derived by impedance cardiography during postural changes and exercise
JO  - Artery Research
SP  - 78
EP  - 84
VL  - 6
IS  - 2
SN  - 1876-4401
UR  - https://doi.org/10.1016/j.artres.2012.02.001
DO  - 10.1016/j.artres.2012.02.001
ID  - Schultz2012
ER  -