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Author Crescencio, J.C. ♦ Martins, L.E.B. ♦ Murta Jr., L.O. ♦ Antloga, C.M. ♦ Kozuki, R.T. ♦ Santos, M.D.B. ♦ Marin Neto, J.A. ♦ Maciel, B.C. ♦ Gallo Jr., L.
Sponsorship European Soc. of Cardiology ♦ Nat. Inst. of Health, USA
Source IEEE Xplore Digital Library
Content type Text
Publisher Institute of Electrical and Electronics Engineers, Inc. (IEEE)
File Format PDF
Copyright Year ©2003
Language English
Subject Domain (in DDC) Computer science, information & general works ♦ Data processing & computer science ♦ Technology ♦ Medicine & health
Subject Keyword Mathematical model ♦ Voltage-controlled oscillators ♦ Cardiology ♦ Real time systems ♦ Carbon dioxide ♦ Production ♦ Software measurement ♦ Least squares methods ♦ Fitting ♦ Graphics
Abstract The anaerobic threshold (AT) during dynamic physical exercise is a good parameter to quantify oxygen uptake and transport which reflects the functional cardiorespiratory reserve in men. The increasing use of computerized ergospirometric systems has allowed recording, processing and plotting ventilatory variables, cycle by cycle, on a real time basis. So, response changes in carbon dioxide production (VCO/sub 2/) may be used as a non-invasive measurement of AT. In the present study a custom software was developed to apply bi-segmental models (linear-linear and linear-quadratic) using the least square method for fitting VCO/sub 2/ data. The lowest value of the residual sum of squares found in VCO/sub 2/ graphic plots corresponded to AT, expressed as oxygen uptake. Data analysis showed that, despite the good correlation documented between the linear-linear model and the classical visual method, the mathematical method underestimates the AT values when compared to the visual one.
Description Author affiliation: Div. of Cardiology, Univ. of Sao Paulo, Ribeirao Preto, Brazil (Crescencio, J.C.)
ISBN 078038170X
ISSN 02766547
Educational Role Student ♦ Teacher
Age Range above 22 year
Educational Use Research ♦ Reading
Education Level UG and PG
Learning Resource Type Article
Publisher Date 2003-09-21
Publisher Place Greece
Rights Holder Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Size (in Bytes) 229.64 kB
Page Count 4
Starting Page 801
Ending Page 804


Source: IEEE Xplore Digital Library