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EDUCATION MATERIALS > 1 2 3 4 5 6 |
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Validity of a Portable Metabolic Measurement System
Byard, A D., Dengel, D R. FACSM,
University of Minnesota and the CA Medical Center, Minneapolis, MN
Measurement and analysis of physiological variables such as oxygen uptake (VO2), cardio dioxide production (VCO2) and minute ventilation (VE) are essential to research in exercise physiology, medicine and numerous related fields. Recent advancements in technology have lead to the development of portable systems for the analysis of VO2, VCO2 and VE.
Purpose:
To determine the validity of the MedGraphics VO2000 portable metabolic measurement system (Medical Graphics Corp., St. Paul, MN) for determining VO2, VCO2, and VE.
Methods:
The VO2000 was compared to a MedGraphics CPX/D metabolic measurement system. The two systems were arranged in-series to obtain identical gas samples from subjects and limit biological and environmental variability created from separated test sessions. Twenty healthy young (27.7 ± 9.1 yrs) subjects (12 male, 8 female) volunteered for the study. The mean height and weight were 176.5 cm (± 10.4 and 76.4 kg (± 11.3), respectively. Protocol consisted of subjects pedaling an electronically braked ERG 401 cycle ergometer (Dimeq Corporation, Berlin, Germany) throughout multiple stages of increasing workloads. The first stage consisted of subjects pedaling at 50-60 rpm at zero watts for 4 minutes. The workload was increased 50 watts every 4th minute until the subject could no longer maintain a pedal rate of 50 rpm or greater.
Results:
Coefficient of determination (r2) values for VO2 (0.962), VCO2 (0.968) and VE (0.984 were all significant (P<0.0001). Results of the repeated measures ANOVA indicate there was no significant difference between systems during the last minute of stages 1-4 when measuring VO2, VCO2, and VE (P=0.193, 0.464 and 0.292, respectively). A significant interaction was found between both VO2 and VCO2 and the two systems over time (P<0.01)
Conclusion:
The results of the study confirm that the MedGraphics VO2000 portable metabolic system produces measures of VO2, VCO2, and VE that are comparable to the MedGraphics CPX/D throughout a wide range of workloads.
http://www.acsm-msse.org/
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Byard, A D., Dengel, D R. FACSM. Medicine & Science in Sports & Exercise. Vol.34(5), Supplement 1, p S149. May 2002.
© 2002 The American College of Sports Medicine
Published by Lippincott Williams & Wilkins |
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