Document Detail

Reliability of the VmaxST portable metabolic measurement system.
MedLine Citation:
PMID:  18651368     Owner:  NLM     Status:  MEDLINE    
The purpose of this study was to evaluate the reliability of the VmaxST portable metabolic measurement system. Forty-five healthy adults (age = 25.7 +/- 5.9 yr; height = 171.8 +/- 9.1 cm; weight = 69.6 +/- 12.8 kg; VO2peak) = 40.7 ml/kg/min; percent fat = 21.7 +/- 11.0) performed two separate and identical exercise routines on different days consisting of treadmill walking at 2.0 mph (53.6 m/min), 3.0 mph (80.5 m/min), and 4.0 mph (107.3 m/min) and running at 6.0 mph (160.9 m/min). VE and gas exchange were measured continuously breath-to-breath. A random effects model on log-transformed data yielded coefficients of variation (CV) and intraclass correlation coefficients (ICC) for VO2 and VE of 5.2 - 7.6 %, and 0.77 - 0.92, respectively, for all walking and running trials. For VCO2, CVs were higher (10 - 12 %) and ICCs lower (0.70 - 0.81). Ordinary least squares regression between the individual difference scores and the individual mean scores for VE, VO2 and VCO2, respectively, indicated no systematic bias (all p > 0.05). Bland-Altman analysis also illustrated no systematic bias between repeated measurements. The VmaxST provides reliable measurements of VO2 and VE during walking and running eliciting VE and VO2 at least up to approximately 56 and 2.2 l/min, respectively. The system appears to be less reliable for measuring VCO2.
J Blessinger; B Sawyer; C Davis; B A Irving; A Weltman; G Gaesser
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Publication Detail:
Type:  Evaluation Studies; Journal Article; Research Support, N.I.H., Extramural     Date:  2008-07-23
Journal Detail:
Title:  International journal of sports medicine     Volume:  30     ISSN:  0172-4622     ISO Abbreviation:  Int J Sports Med     Publication Date:  2009 Jan 
Date Detail:
Created Date:  2008-12-16     Completed Date:  2009-03-05     Revised Date:  2013-06-05    
Medline Journal Info:
Nlm Unique ID:  8008349     Medline TA:  Int J Sports Med     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  22-6     Citation Subset:  IM    
Student Health Connection, California State University Sacramento, Sacramento, California, United States.
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MeSH Terms
Carbon Dioxide / analysis
Energy Metabolism / physiology*
Equipment Design
Exercise Test / methods
Least-Squares Analysis
Oxygen Consumption / physiology*
Pulmonary Gas Exchange / physiology*
Reproducibility of Results
Respiratory Function Tests / methods
Running / physiology
Walking / physiology
Young Adult
Grant Support
M01 RR000847-348594/RR/NCRR NIH HHS; R21 CA112323/CA/NCI NIH HHS; R21 CA112323-02/CA/NCI NIH HHS; RR00847/RR/NCRR NIH HHS
Reg. No./Substance:
124-38-9/Carbon Dioxide

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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