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Evaluation of the Oxycon Mobile metabolic system against the Douglas bag method.
Swedish School of Sport and Health Sciences, GIH, Department of Sport and Health Sciences, The Laboratory of Applied Sports Science (LTIV). Swedish School of Sport and Health Sciences, GIH, Department of Sport and Health Sciences, Åstrand Laboratory of Work Physiology, The Research Unit for Movement, Health and Environment. Swedish School of Sport and Health Sciences, GIH, Department of Sport and Health Sciences, Laboratory for Biomechanics and Motor Control.ORCID iD: 0000-0001-8161-5610
Swedish School of Sport and Health Sciences, GIH, Department of Sport and Health Sciences, Åstrand Laboratory of Work Physiology, The Research Unit for Movement, Health and Environment.ORCID iD: 0000-0001-5213-4439
Swedish School of Sport and Health Sciences, GIH, Department of Sport and Health Sciences, Åstrand Laboratory of Work Physiology, Björn Ekblom's and Mats Börjesson's research group.
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2010 (English)In: European Journal of Applied Physiology, ISSN 1439-6319, E-ISSN 1439-6327, Vol. 109, no 2, p. 159-171Article in journal (Refereed) Published
Abstract [en]

The aim of this study was to evaluate two versions of the Oxycon Mobile portable metabolic system (OMPS1 and OMPS2) in a wide range of oxygen uptake, using the Douglas bag method (DBM) as criterion method. The metabolic variables VO2, VCO2, respiratory exchange ratio and VE were measured during submaximal and maximal cycle ergometer exercise with sedentary, moderately trained individuals and athletes as participants. Test-retest reliability was investigated using the OMPS1. The coefficients of variation varied between 2 and 7% for the metabolic parameters measured at different work rates and resembled those obtained with the DBM. With the OMPS1, systematic errors were found in the determination of VO2 and VCO2. At submaximal work rates VO2 was 6-14% and VCO2 5-9% higher than with the DBM. At VO2max both VO2 and VCO2 were slightly lower as compared to DBM (-4.1 and -2.8% respectively). With OMPS2, VO2 was determined accurately within a wide measurement range (about 1-5.5 L min(-1)), while VCO2 was overestimated (3-7%). VE was accurate at submaximal work rates with both OMPS1 and OMPS2, whereas underestimations (4-8%) were noted at VO2max. The present study is the first to demonstrate that a wide range of VO2 can be measured accurately with the Oxycon Mobile portable metabolic system (second generation). Future investigations are suggested to clarify reasons for the small errors noted for VE and VCO2 versus the Douglas bag measurements, and also to gain knowledge of the performance of the device under applied and non-laboratory conditions.

Place, publisher, year, edition, pages
2010. Vol. 109, no 2, p. 159-171
National Category
Medical and Health Sciences
Research subject
Medicine/Technology
Identifiers
URN: urn:nbn:se:gih:diva-1058DOI: 10.1007/s00421-009-1326-9PubMedID: 20043228OAI: oai:DiVA.org:gih-1058DiVA, id: diva2:284548
Projects
FAAPAvailable from: 2010-01-07 Created: 2010-01-07 Last updated: 2018-09-03Bibliographically approved
In thesis
1. The heart rate method for estimating oxygen uptake in walking and cycle commuting: Evaluations based on reproducibility and validity studies of the heart rate method and a portable metabolic system
Open this publication in new window or tab >>The heart rate method for estimating oxygen uptake in walking and cycle commuting: Evaluations based on reproducibility and validity studies of the heart rate method and a portable metabolic system
2018 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Walking and cycling to work can contribute to population health, but more objective knowledge concerning exercise intensities, oxygen uptake and the metabolic demands of this physical activity is needed for this and other evaluations. To attain this, valid and reliable instruments are a requirement. The focus of this thesis was to evaluate whether the heart rate method can be used for this purpose. It involves establishing the relation between heart rate and oxygen uptake during ergometer cycling in laboratory conditions, and thereafter checking if the same relation exists during cycle or walking commuting in a metropolitan area.

To accomplish this, a portable metabolic system was tested for validity and reliability in laboratory and field conditions and the reproducibility of the heart rate and oxygen uptake relation in the laboratory was evaluated. Furthermore, the heart rate and oxygen uptake relations during cycle and walking commuting was compared with those attained in the laboratory.

The first two studies showed that a portable metabolic system is valid during laboratory and sustained field conditions. Studies 3 and 4 showed that the heart rate method with respect to the heart rate-oxygen uptake relationship is reliable on the group level for both walking and cycling commuters during repeated measures in the laboratory. The last two studies showed that applying the heart rate method during cycle commuting leads to valid levels of oxygen uptake on the group level for both males and females. Contrary to that, the measured levels of oxygen uptake in the field during walking commuting were on average 17% higher for males, and 13% higher for females than the values obtained with the heart rate method. For both walking and cycling commuters, the individual spread around the mean values was rather high, creating somewhat wide confidence intervals for the mean values.

In summary, the heart rate method can be used for cycle commuters during their normal commuting conditions, while for pedestrians it is necessary to take into account that oxygen uptake per heart rate is higher while walking than that estimated from ergometer cycling in the laboratory.

Place, publisher, year, edition, pages
Stockholm: Gymnastik- och idrottshögskolan, GIH, 2018. p. 110
Series
Avhandlingsserie för Gymnastik- och idrottshögskolan ; 13
Keywords
Heart rate, Oxygen consumption, Validity, Reproducibility, Oxycon Mobile, Douglas Bag Method, Cycle commuting, Walking commuting
National Category
Other Natural Sciences
Research subject
Medicine/Technology
Identifiers
urn:nbn:se:gih:diva-5400 (URN)978-91-983151-4-1 (ISBN)
Public defence
2018-09-28, Aulan, GIH, Lidingöv. 1, 114 33 Stockholm, 09:00 (English)
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Supervisors
Available from: 2018-09-03 Created: 2018-09-03 Last updated: 2018-09-11Bibliographically approved

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Rosdahl, HansSalier Eriksson, JaneSchantz, Peter

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