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Validity of the Oxycon Mobile metabolic system under field measuring conditions
Gymnastik- och idrottshögskolan, GIH, Institutionen för idrotts- och hälsovetenskap, Åstrandlaboratoriet, FoU-gruppen för rörelse, hälsa och miljö.ORCID-id: 0000-0001-5213-4439
Gymnastik- och idrottshögskolan, GIH, Institutionen för idrotts- och hälsovetenskap, Åstrandlaboratoriet, FoU-gruppen för rörelse, hälsa och miljö.ORCID-id: 0000-0001-8161-5610
Gymnastik- och idrottshögskolan, GIH, Institutionen för idrotts- och hälsovetenskap, Åstrandlaboratoriet, FoU-gruppen för rörelse, hälsa och miljö.ORCID-id: 0000-0003-3547-425X
2012 (engelsk)Inngår i: European Journal of Applied Physiology, ISSN 1439-6319, E-ISSN 1439-6327, Vol. 112, nr 1, s. 345-355Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Abstract

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.

 

sted, utgiver, år, opplag, sider
Springer, 2012. Vol. 112, nr 1, s. 345-355
Emneord [en]
Oxycon Mobile, Douglas bag method, external wind, humidity, temperature, stability
HSV kategori
Forskningsprogram
Medicin/Teknik
Identifikatorer
URN: urn:nbn:se:gih:diva-1649DOI: 10.1007/s00421-011-1985-1OAI: oai:DiVA.org:gih-1649DiVA, id: diva2:379594
Prosjekter
Physical Active Commuting in Greater Stockholm, www.gih.se/pacsFAAPTilgjengelig fra: 2010-12-18 Laget: 2010-12-18 Sist oppdatert: 2018-09-03bibliografisk kontrollert
Inngår i avhandling
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
Åpne denne publikasjonen i ny fane eller vindu >>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 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
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.

sted, utgiver, år, opplag, sider
Stockholm: Gymnastik- och idrottshögskolan, GIH, 2018. s. 110
Serie
Avhandlingsserie för Gymnastik- och idrottshögskolan ; 13
Emneord
Heart rate, Oxygen consumption, Validity, Reproducibility, Oxycon Mobile, Douglas Bag Method, Cycle commuting, Walking commuting
HSV kategori
Forskningsprogram
Medicin/Teknik
Identifikatorer
urn:nbn:se:gih:diva-5400 (URN)978-91-983151-4-1 (ISBN)
Disputas
2018-09-28, Aulan, GIH, Lidingöv. 1, 114 33 Stockholm, 09:00 (engelsk)
Opponent
Veileder
Prosjekter
FAAP
Tilgjengelig fra: 2018-09-03 Laget: 2018-09-03 Sist oppdatert: 2019-05-02bibliografisk kontrollert

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