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Article: Validity, reliability and stability of the portable Cortex Metamax 3B gas analysis system

TitleValidity, reliability and stability of the portable Cortex Metamax 3B gas analysis system
Authors
KeywordsMetamax
Portable gas analysis
Reliability
Stability
Validity
Issue Date2012
PublisherSpringer. The Journal's web site is located at http://www.springer.com/biomed/human+physiology/journal/421
Citation
European Journal Of Applied Physiology, 2012, v. 112 n. 7, p. 2539-2547 How to Cite?
AbstractThis study investigated the performance of the portable Cortex Metamax 3B (MM3B) automated gas analysis system during both simulated and human exercise using adolescents. Repeated measures using a Gas Exchange System Validator (GESV) across a range of simulated metabolic rates, showed the MM3B to be adequately reliable (both percentage errors, and percentage technical error of measurements <2%) for measuring expired ventilation (V E), oxygen consumption (VO 2), and carbon dioxide production (VCO 2). Over a 3 h period, the MM3B was shown to be acceptably stable in measuring gas fractions, as well as V E, VO 2, and VCO 2 generated by the GESV, especially at moderate and high metabolic rates (drifts <2% and of minor physiological significance). Using eight healthy adolescents during rest, moderate, and vigorous cycle ergometry, the validity of the MM3B was tested against the primary criterion Douglas bag method (DBM) and a secondary criterion machine known to be accurate, the Jaeger Oxycon Pro system. No significant errors in V E were noted, yet the MM3B significantly overestimated both VO 2 and VCO 2 by approximately 10-17% at moderate and vigorous exercise as compared to the DBM and at all exercise levels compared to the Oxycon Pro. No significant differences were seen in any metabolic variable between the two criterion systems (DBM and Oxycon Pro). It is concluded the MM3B produces acceptably stable and reliable results, but is not adequately valid during moderate and vigorous exercise without some further correction of VO 2 and VCO 2. © The Author(s) 2011. This article is published with open access at Springerlink.com.
Persistent Identifierhttp://hdl.handle.net/10722/147089
ISSN
2015 Impact Factor: 2.328
2015 SCImago Journal Rankings: 1.145
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorMacfarlane, DJen_HK
dc.contributor.authorWong, Pen_HK
dc.date.accessioned2012-05-25T07:50:35Z-
dc.date.available2012-05-25T07:50:35Z-
dc.date.issued2012en_HK
dc.identifier.citationEuropean Journal Of Applied Physiology, 2012, v. 112 n. 7, p. 2539-2547en_HK
dc.identifier.issn1439-6319en_HK
dc.identifier.urihttp://hdl.handle.net/10722/147089-
dc.description.abstractThis study investigated the performance of the portable Cortex Metamax 3B (MM3B) automated gas analysis system during both simulated and human exercise using adolescents. Repeated measures using a Gas Exchange System Validator (GESV) across a range of simulated metabolic rates, showed the MM3B to be adequately reliable (both percentage errors, and percentage technical error of measurements <2%) for measuring expired ventilation (V E), oxygen consumption (VO 2), and carbon dioxide production (VCO 2). Over a 3 h period, the MM3B was shown to be acceptably stable in measuring gas fractions, as well as V E, VO 2, and VCO 2 generated by the GESV, especially at moderate and high metabolic rates (drifts <2% and of minor physiological significance). Using eight healthy adolescents during rest, moderate, and vigorous cycle ergometry, the validity of the MM3B was tested against the primary criterion Douglas bag method (DBM) and a secondary criterion machine known to be accurate, the Jaeger Oxycon Pro system. No significant errors in V E were noted, yet the MM3B significantly overestimated both VO 2 and VCO 2 by approximately 10-17% at moderate and vigorous exercise as compared to the DBM and at all exercise levels compared to the Oxycon Pro. No significant differences were seen in any metabolic variable between the two criterion systems (DBM and Oxycon Pro). It is concluded the MM3B produces acceptably stable and reliable results, but is not adequately valid during moderate and vigorous exercise without some further correction of VO 2 and VCO 2. © The Author(s) 2011. This article is published with open access at Springerlink.com.en_HK
dc.languageengen_US
dc.publisherSpringer. The Journal's web site is located at http://www.springer.com/biomed/human+physiology/journal/421en_HK
dc.relation.ispartofEuropean Journal of Applied Physiologyen_HK
dc.rightsThe Author(s)en_US
dc.rightsCreative Commons: Attribution 3.0 Hong Kong Licenseen_US
dc.subjectMetamaxen_HK
dc.subjectPortable gas analysisen_HK
dc.subjectReliabilityen_HK
dc.subjectStabilityen_HK
dc.subjectValidityen_HK
dc.titleValidity, reliability and stability of the portable Cortex Metamax 3B gas analysis systemen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://www.springerlink.com/link-out/?id=2104&code=KVG13867U70U7488&MUD=MPen_US
dc.identifier.emailMacfarlane, DJ: djmac@hku.hken_HK
dc.identifier.authorityMacfarlane, DJ=rp00934en_HK
dc.description.naturepublished_or_final_versionen_US
dc.identifier.doi10.1007/s00421-011-2230-7en_HK
dc.identifier.pmid22075643-
dc.identifier.scopuseid_2-s2.0-84864648332en_HK
dc.identifier.hkuros206646-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-84864648332&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume112en_HK
dc.identifier.issue7en_HK
dc.identifier.spage2539en_HK
dc.identifier.epage2547en_HK
dc.identifier.eissn1439-6327en_US
dc.identifier.isiWOS:000305129300017-
dc.publisher.placeGermanyen_HK
dc.description.otherSpringer Open Choice, 25 May 2012en_US
dc.identifier.scopusauthoridMacfarlane, DJ=7202978517en_HK
dc.identifier.scopusauthoridWong, P=54382560300en_HK
dc.identifier.citeulike10028637-

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