Cargando…

Gas analyzer's drift leads to systematic error in maximal oxygen uptake and maximal respiratory exchange ratio determination

The aim was to examine the drift in the measurements of fractional concentration of oxygen (FO(2)) and carbon dioxide (FCO(2)) of a Nafion-using metabolic cart during incremental maximal exercise in 18 young and 12 elderly males, and to propose a way in which the drift can be corrected. The drift wa...

Descripción completa

Detalles Bibliográficos
Autores principales: Garcia-Tabar, Ibai, Eclache, Jean P., Aramendi, José F., Gorostiaga, Esteban M.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Frontiers Media S.A. 2015
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4626835/
https://www.ncbi.nlm.nih.gov/pubmed/26578980
http://dx.doi.org/10.3389/fphys.2015.00308
_version_ 1782398169993183232
author Garcia-Tabar, Ibai
Eclache, Jean P.
Aramendi, José F.
Gorostiaga, Esteban M.
author_facet Garcia-Tabar, Ibai
Eclache, Jean P.
Aramendi, José F.
Gorostiaga, Esteban M.
author_sort Garcia-Tabar, Ibai
collection PubMed
description The aim was to examine the drift in the measurements of fractional concentration of oxygen (FO(2)) and carbon dioxide (FCO(2)) of a Nafion-using metabolic cart during incremental maximal exercise in 18 young and 12 elderly males, and to propose a way in which the drift can be corrected. The drift was verified by comparing the pre-test calibration values with the immediate post-test verification values of the calibration gases. The system demonstrated an average downscale drift (P < 0.001) in FO(2) and FCO(2) of −0.18% and −0.05%, respectively. Compared with measured values, corrected average maximal oxygen uptakevalues were 5–6% lower (P < 0.001) whereas corrected maximal respiratory exchange ratio values were 8–9% higher (P < 0.001). The drift was not due to an electronic instability in the analyzers because it was reverted after 20 min of recovery from the end of the exercise. The drift may be related to an incomplete removal of water vapor from the expired gas during transit through the Nafion conducting tube. These data demonstrate the importance of checking FO(2) and FCO(2) values by regular pre-test calibrations and post-test verifications, and also the importance of correcting a possible shift immediately after exercise.
format Online
Article
Text
id pubmed-4626835
institution National Center for Biotechnology Information
language English
publishDate 2015
publisher Frontiers Media S.A.
record_format MEDLINE/PubMed
spelling pubmed-46268352015-11-17 Gas analyzer's drift leads to systematic error in maximal oxygen uptake and maximal respiratory exchange ratio determination Garcia-Tabar, Ibai Eclache, Jean P. Aramendi, José F. Gorostiaga, Esteban M. Front Physiol Physiology The aim was to examine the drift in the measurements of fractional concentration of oxygen (FO(2)) and carbon dioxide (FCO(2)) of a Nafion-using metabolic cart during incremental maximal exercise in 18 young and 12 elderly males, and to propose a way in which the drift can be corrected. The drift was verified by comparing the pre-test calibration values with the immediate post-test verification values of the calibration gases. The system demonstrated an average downscale drift (P < 0.001) in FO(2) and FCO(2) of −0.18% and −0.05%, respectively. Compared with measured values, corrected average maximal oxygen uptakevalues were 5–6% lower (P < 0.001) whereas corrected maximal respiratory exchange ratio values were 8–9% higher (P < 0.001). The drift was not due to an electronic instability in the analyzers because it was reverted after 20 min of recovery from the end of the exercise. The drift may be related to an incomplete removal of water vapor from the expired gas during transit through the Nafion conducting tube. These data demonstrate the importance of checking FO(2) and FCO(2) values by regular pre-test calibrations and post-test verifications, and also the importance of correcting a possible shift immediately after exercise. Frontiers Media S.A. 2015-10-30 /pmc/articles/PMC4626835/ /pubmed/26578980 http://dx.doi.org/10.3389/fphys.2015.00308 Text en Copyright © 2015 Garcia-Tabar, Eclache, Aramendi and Gorostiaga. http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
spellingShingle Physiology
Garcia-Tabar, Ibai
Eclache, Jean P.
Aramendi, José F.
Gorostiaga, Esteban M.
Gas analyzer's drift leads to systematic error in maximal oxygen uptake and maximal respiratory exchange ratio determination
title Gas analyzer's drift leads to systematic error in maximal oxygen uptake and maximal respiratory exchange ratio determination
title_full Gas analyzer's drift leads to systematic error in maximal oxygen uptake and maximal respiratory exchange ratio determination
title_fullStr Gas analyzer's drift leads to systematic error in maximal oxygen uptake and maximal respiratory exchange ratio determination
title_full_unstemmed Gas analyzer's drift leads to systematic error in maximal oxygen uptake and maximal respiratory exchange ratio determination
title_short Gas analyzer's drift leads to systematic error in maximal oxygen uptake and maximal respiratory exchange ratio determination
title_sort gas analyzer's drift leads to systematic error in maximal oxygen uptake and maximal respiratory exchange ratio determination
topic Physiology
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4626835/
https://www.ncbi.nlm.nih.gov/pubmed/26578980
http://dx.doi.org/10.3389/fphys.2015.00308
work_keys_str_mv AT garciatabaribai gasanalyzersdriftleadstosystematicerrorinmaximaloxygenuptakeandmaximalrespiratoryexchangeratiodetermination
AT eclachejeanp gasanalyzersdriftleadstosystematicerrorinmaximaloxygenuptakeandmaximalrespiratoryexchangeratiodetermination
AT aramendijosef gasanalyzersdriftleadstosystematicerrorinmaximaloxygenuptakeandmaximalrespiratoryexchangeratiodetermination
AT gorostiagaestebanm gasanalyzersdriftleadstosystematicerrorinmaximaloxygenuptakeandmaximalrespiratoryexchangeratiodetermination