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Validity of the Oxycon Mobile metabolic system under field measuring conditions
Swedish Sch Sport & Hlth, Lab Appl Sport Sci, GIH, Stockholm, Sweden .
Swedish Sch Sport & Hlth, Lab Appl Sport Sci, GIH, Stockholm, Sweden .
Mid Sweden University, Faculty of Human Sciences, Department of Health Sciences.
2012 (English)In: European Journal of Applied Physiology, ISSN 1439-6319, E-ISSN 1439-6327, Vol. 112, no 1, 345-355 p.Article in journal (Refereed) Published
Abstract [en]

Purpose: It is essential to validate portable metabolic systems, not only in laboratory settings, but also in field measuring conditions, such as prolonged moderate exercise at low temperatures, high humidity and with external wind.

 

Methods: VO2, VCO2, RER and VE were measured using the Oxycon Mobile (OM), with a windshield, during cycle ergometer exercise: (I) indoors at three submaximal workloads with no wind or with external wind (13–20 m·s-1) from front, side and back; (II) at two submaximal workloads outdoors (12 ± 2oC; 86 ± 7% RH), with and without a system for drying the ambient air around the air sampling tube; and (III) at one workload outdoors for 45 min (5 ± 4oC; 69 ± 16.5% RH). Any physiological drift was checked for with pre- and postmeasurements by the Douglas bag method (DBM).

 

Results: A minor effect of external wind from behind was noted in RER and VE (-2 and -3%).. The system for drying the ambient air around the gas sampling tube had no effect on the measured levels. A small difference in VCO2 drift between the OM and DBM (1.5 mL·min-2) was noted in the stability test.

 

Conclusion: Heavy external wind applied from different directions generally does not affect the measurements of the OM. Furthermore, when using a unit for drying the ambient air around the gas sampling tube, the OM can accurately measure VO2, RER and VE   at submaximal workloads for at least45 min under challenging conditions with regard to humidity and temperature.

Place, publisher, year, edition, pages
2012. Vol. 112, no 1, 345-355 p.
Keyword [en]
Oxycon Mobile, Douglas bag method, external wind, humidity, temperature, stability
National Category
Sport and Fitness Sciences
Identifiers
URN: urn:nbn:se:miun:diva-13781DOI: 10.1007/s00421-011-1985-1ISI: 000299002500036Scopus ID: 2-s2.0-84856514648OAI: oai:DiVA.org:miun-13781DiVA: diva2:417056
Projects
Physically active commuting in Greater Stockholm, www.gih.se\pacs
Available from: 2011-05-14 Created: 2011-05-14 Last updated: 2012-08-07Bibliographically approved

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