Journal of Sports Science and Medicine
Journal of Sports Science and Medicine
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ISSN: 1303 - 2968   
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©Journal of Sports Science and Medicine (2008) 07, 532 - 536

Research article
Validation of a New Portable Metabolic System During an Incremental Running Test
Víctor Díaz1, Pedro José Benito1, Ana Belén Peinado1, María Álvarez1, Carlos Martín1, Valter Di Salvo2, Fabio Pigozzi2, Nicola Maffulli3, , Fracisco Javier Calderón1
Author Information
1 Laboratory of Exercise Physiology, Faculty of Physical Activity and Sports Science (INEF), Technical University of Madrid,
2 Department of Health Sciences, Rome University of Movement and Science, Italy
3 Department of Trauma and Orthopaedic Surgery, Keele University Medical School, England

Nicola Maffulli
✉ Department of Trauma and Orthopaedic Surgery, Keele University Medical School, Store On Trent, England.
Email: n.maffulli@keele.ac.uk
Publish Date
Received: 11-09-2008
Accepted: 21-10-2008
Published (online): 01-12-2008
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ABSTRACT

We tested a new portable metabolic system, the Jaeger Oxycon Mobile (OM) at a range of running speeds. Six subjects carried out, in random order, two incremental tests on a treadmill, one of them using the OM, and the other using the Jaeger Oxycon Pro (OP). There are systematic errors in the measurements of oxygen consumption (VO2) and respiratory exchange ratio (RER) with the OM. Production of CO2 (VCO2) tends to be overestimated by the OM, although the differences are not significant. Ventilation (VE) showed very similar values in both analyzers. Data of VO2 and RER were corrected with a regression equation which minimised the differences among the devices. The portable metabolic system OM makes systematic errors in measurements of VO2 and RER which can be adjusted with a regression analysis to obtain data comparable to those obtained by fixed systems.
Key words: Portable metabolic chart, accuracy, consistency, running, oxygen consumption


           Key Points
  • Portable metabolic systems are frequently used to explore various physiological ventilatory variables in field tests.
  • There are systematic errors in the measurements of oxygen consumption (VO2) and respiratory exchange ratio (RER) with the Jaeger Oxycon Mobile (OM) portable metabolic system
  • Production of CO2 (VCO2) tends to be overestimated by the OM
  • Data of VO2 and RER can be corrected with a regression equation
  • The portable metabolic system OM makes systematic errors in measurements of VO2 and RER which can be adjusted with a regression analysis to obtain data comparable to those obtained by fixed systems
 
 
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