Journal of Sports Science and Medicine
Journal of Sports Science and Medicine
ISSN: 1303 - 2968   
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©Journal of Sports Science and Medicine (2012) 11, 182 - 183

Letter to editor
Validation of The Oxycon Mobile Metabolic System in Healthy Subjects
Marco A. Akkermans1 , Maurice J.H. Sillen2, Emiel F.M. Wouters3, Martijn A. Spruit2
Author Information
1 Department of Biometrics,
2 Program Development Centre, CIRO+ Horn, the Netherlands
3 Department of Respiratory Medicine, MUMC+ Maastricht, the Netherlands

Marco A. Akkermans
✉ Department of Biometrics, CIRO+, center of expertise for chronic organ failure, Hornerheide 1, Horn, the Netherlands
Email: marcoakkermans@ciro-horn.nl
Publish Date
Received: 28-12-2011
Accepted: 17-01-2012
Published (online): 01-03-2012
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Dear Editor-in-Chief

Oxygen uptake (VO2) and carbon dioxide production (VCO2) are commonly measured under laboratory conditions by using automated metabolic gas analysis systems (Macfarlane, 2001). Nowadays, gas exchange measurements take place more often under functional conditions e.g. in sports medicine (Smekal et al., 2003); and in assessing physiologic limitations during the performance of activities of daily life or during different exercise training modalities in patients with chronic organ failure (Sillen et al., 2008; 2011; Spruit et al., 2011; Vaes et al., 2011a; 2011b). So, there is a great need to accurately measure metabolic requirements under different 'dynamic' non-laboratory conditions. The objective of this study was to compare the Oxycon Pro with two Oxycon Mobile devices on gas exchange responses in healthy subjects during constant work rate cycle ergometry. Furthermore we aimed to investigate the agreement between two oxycon mobile metabolic systems.

Twenty-two healthy adults (11 women; age: 33.2±11.2 years; body mass index: 23.4 ± 2.9 kg·m-2) consented to perform three cycle exercise tests on the same electromagnetically braked bicycle ergometer (Ergoline Ergoselect 200 P, Carefusion Netherlands, Houten, The Netherlands) with different ergospirometers, which were randomly assigned. Each test consisted of three minutes rest followed by 5 minutes of cycling at 100 Watts (60 revolutions per minute). One Oxycon Pro and two Oxycon Mobiles (second generation; all Carefusion Netherlands, Houten, The Netherlands) were used to assess breath-by-breath VO2, VCO2, and minute ventilation (VE). Prior to each test the devices were calibrated automatically. The facemask was connected to the skin of the subject and it was verified that there was no leakage of air. All measurements were carried out at room temperature between 20 and 22°C, in an air conditioned laboratory.

Data are presented as mean ± SEM, coefficients of variation and intraclass correlations were calculated. Exercise values were averaged per 30 seconds for all subjects. Agreement between the three devices was graphically displayed with Bland-Altman plots. SPSS 17.0 was used for analyses.

All participants completed the exercise protocol. VO2 averaged between 1439 and 1448 mL·min-1 during exercise; VCO2 between 1346 and 1375 mL·min-1; and VE between 35.7 to 36.2 L·min-1. Differences between the three metabolic devices were non-significant. Coefficients of variation between the three devices were low (Table 1). Bland and Altman plots for VO2, VCO2, and VE showed good agreement between the 3 metabolic devices (Figure 1). Indeed, intraclass correlations ranged between 0.798 and 0.925 (p < 0.01).

This is the first study in which the Oxycon Mobile metabolic system has been evaluated against the Oxycon Pro. The Oxycon Mobile metabolic system is reliable for determination of VO2, VCO2 and VE during a constant work rate test at 100 Watts in healthy subjects. A good consistency and a good reliability of measurements were found amongst the three metabolic devices. This is in line with the findings of Rosdahl et al., 2010 who validated the Oxycon Mobile against the Douglas Bag method. Obviously, the current findings need to be replicated in diseased populations and at higher workloads in healthy subjects. Furthermore, this study was conducted on a stationary bicycle ergometer under strictly controlled laboratory conditions, while the Oxycon Mobile is an apparatus suitable for field tests. This warrants further studies.

AUTHOR BIOGRAPHY

Journal of Sports Science and Medicine Marco A. Akkermans
Employment: Department of Respiratory Medicine
Degree:
Research interests:
E-mail: marcoakkermans@ciro-horn.nl
 

Journal of Sports Science and Medicine Maurice J.H. Sillen
Employment: Department of Respiratory Medicine
Degree:
Research interests:
E-mail:
 

Journal of Sports Science and Medicine Emiel F.M. Wouters
Employment: Department of Respiratory Medicine
Degree:
Research interests:
E-mail:
 

Journal of Sports Science and Medicine Martijn A. Spruit
Employment: Department of Respiratory Medicine
Degree:
Research interests:
E-mail:
 
REFERENCES
Journal of Sports Science and Medicine Macfarlane D.J. (2001) Automated metabolic gas analysis systems: a review. Sports Medicine 31, 841-861.
Journal of Sports Science and Medicine Rosdahl H., Gullstrand L., Salier-Eriksson J., Johansson P., Schantz P. (2010) Evaluation of the Oxycon Mobile metabolic system against the Douglas bag method. European Journal of Applied Physiology 109, 159-171.
Journal of Sports Science and Medicine Sillen M.J., Janssen P.P., Akkermans M.A., Wouters E.F., Spruit M.A. (2008) The metabolic response during resistance training and neuromuscular electrical stimulation (NMES) in patients with COPD, a pilot study. Respiratory Medicine 102, 786-789.
Journal of Sports Science and Medicine Sillen M.J., Wouters E.F., Franssen F.M., Meijer K., Stakenborg K.H., Spruit M.A. (2011) Oxygen uptake, ventilation, and symptoms during low-frequency versus high-frequency NMES in COPD: a pilot study. Lung 189, 21-26.
Journal of Sports Science and Medicine Smekal G., von Duvillard S.P., Pokan R., Tschan H., Baron R., Hofmann P., Wonisch M., Bachl N. (2003) Changes in blood lactate and respiratory gas exchange measures in sports with discontinuous load profiles. European Journal of Applied Physiology 89, 489-495.
Journal of Sports Science and Medicine Spruit M.A., Wouters E.F., Eterman R.M., Meijer K., Wagers S.S., Stakenborg K.H., Uszko-Lencer N.H. (2011) Task-related oxygen uptake and symptoms during activities of daily life in CHF patients and healthy subjects. European Journal of Applied Physiology 111, 1679-1686.
Journal of Sports Science and Medicine Vaes A.W., Annegarn J., Meijer K., Cuijpers M.W., Franssen F.M., Wiechert J., Wouters E.F., Spruit M.A. (2011a) The effects of a ‘new’ walking aid on exercise performance in patients with COPD: A randomized cross-over trial. Chest , -.
Journal of Sports Science and Medicine Vaes A.W., Wouters E.F., Franssen F.M., Uszko-Lencer N.H., Stakenborg K.H., Westra M., Meijer K., Schols A.M., Janssen P.P., Spruit M.A. (2011b) Task-related oxygen uptake during domestic activities of daily life in patients with COPD and healthy elderly subjects. Chest 1140, 970-979.
 
 
 
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