Document Detail

Reliability of peak VO(2) and maximal cardiac output assessed using thoracic bioimpedance in children.
MedLine Citation:
PMID:  15827735     Owner:  NLM     Status:  MEDLINE    
The purpose of this study was to evaluate the reliability of a thoracic electrical bioimpedance based device (PhysioFlow) for the determination of cardiac output and stroke volume during exercise at peak oxygen uptake (peak VO(2) in children. The reliability of peak VO(2) is also reported. Eleven boys and nine girls aged 10-11 years completed a cycle ergometer test to voluntary exhaustion on three occasions each 1 week apart. Peak VO(2) was determined and cardiac output and stroke volume at peak VO(2) were measured using a thoracic bioelectrical impedance device (PhysioFlow). The reliability of peak VO(2) cardiac output and stroke volume were determined initially from pairwise comparisons and subsequently across all three trials analysed together through calculation of typical error and intraclass correlation. The pairwise comparisons revealed no consistent bias across tests for all three measures and there was no evidence of non-uniform errors (heteroscedasticity). When three trials were analysed together typical error expressed as a coefficient of variation was 4.1% for peak VO(2) 9.3% for cardiac output and 9.3% for stroke volume. Results analysed by sex revealed no consistent differences. The PhysioFlow method allows non-invasive, beat-to-beat determination of cardiac output and stroke volume which is feasible for measurements during maximal exercise in children. The reliability of the PhysioFlow falls between that demonstrated for Doppler echocardiography (5%) and CO(2) rebreathing (12%) at maximal exercise but combines the significant advantages of portability, lower expense and requires less technical expertise to obtain reliable results.
Joanne Welsman; Katie Bywater; Colin Farr; Deborah Welford; Neil Armstrong
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Publication Detail:
Type:  Evaluation Studies; Journal Article; Research Support, Non-U.S. Gov't     Date:  2005-05-26
Journal Detail:
Title:  European journal of applied physiology     Volume:  94     ISSN:  1439-6319     ISO Abbreviation:  Eur. J. Appl. Physiol.     Publication Date:  2005 Jun 
Date Detail:
Created Date:  2005-05-26     Completed Date:  2005-08-23     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  100954790     Medline TA:  Eur J Appl Physiol     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  228-34     Citation Subset:  IM    
Children's Health and Exercise Research Centre, University of Exeter, Heavitree Road, Exeter, EX1 2LU, UK.
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MeSH Terms
Cardiac Output*
Electric Impedance*
Equipment and Supplies
Exercise Test
Models, Cardiovascular
Oxygen Consumption*
Reproducibility of Results
Stroke Volume
Thorax / physiology*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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