Validity and Reliability of the VM Pro


This study aimed to determine the validity and reliability of the VM Pro when compared to a VacuMed metabolic simulator. The VacuMed simulator has been validated with the industry-standard Douglas bag method [2] and has been used to validate popular VO2 analyzers such as the Cosmed K5 [3]. The simulator’s design is based on concepts discussed by Huszczuk and Wasserman [4].


Twenty-four different set points of ventilation and metabolism were applied to two VM Pros, to examine accuracy and repeatability over a broad range. Bland-Altman plots, ordinary least products regression (OLP), mean percentage differences and typical percentage error were analyzed. A two-way random intraclass correlation (ICC) model was used to determine ICC coefficients to further determine reliability.


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