Document Detail


Modelling the VO2 kinetic response to heavy intensity exercise in children.
MedLine Citation:
PMID:  15697067     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
The purpose of this study was to apply a series of mathematical models in order to investigate the nature of the kinetic response to heavy intensity exercise with children and identify a suitable model with which to estimate parameters of the response. Sixty two children (35 male, 27 female aged 10-15 years) completed four transitions from baseline pedalling to 40% of the difference between their previously determined anaerobic threshold and peak VO2 on an electronically braked cycle ergometer. Initially three models were fitted to the averaged response profiles following the end of phase 1. and their residuals compared; 1, a single exponential with a delay term; 2, an exponential and linear term with independent delays; and 3, a double exponential with independent delays. Up to 95% of the response profiles were better fitted by either model 2 or 3 (p < 0.05), and model 3 was a statistically better fit (p < 0.05) than model 2 in 77% of cases. Residual inspection confirmed the superior fit by model 3. A fourth model which consisted of a single exponential with a delay term was fitted within the phase 2 fitting window. Estimated parameters (A1 and tau1), using model 4 were not significantly different from model 3, and model 4 was identified as the model of choice due to the wide confidence intervals in tau2 and A2 using model 3. It was concluded that the nature of the response to heavy intensity exercise in children is similar to that previously reported with adults and that the response should be modelled accordingly.
Authors:
Samantha G Fawkner; Neil Armstrong
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Ergonomics     Volume:  47     ISSN:  0014-0139     ISO Abbreviation:  Ergonomics     Publication Date:  2004 Nov 
Date Detail:
Created Date:  2005-02-08     Completed Date:  2005-03-03     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0373220     Medline TA:  Ergonomics     Country:  England    
Other Details:
Languages:  eng     Pagination:  1517-27     Citation Subset:  IM; S    
Affiliation:
Children's Health and Exercise Research Centre, University of Exeter, Exeter, UK. S.G.Fawkner@hw.ac.uk
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MeSH Terms
Descriptor/Qualifier:
Adolescent
Child
Exercise / physiology*
Exercise Test
Female
Humans
Male
Models, Biological
Oxygen Consumption*
Pulmonary Gas Exchange

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


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