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CROSS SYSTEM RELIABILITY OF COSMED K4b2 vs. PARVO 2400 TRUE ONE METABOLIC SYSTEMS

Abstract

CROSS SYSTEM RELIABILITY OF COSMED K4b2 vs. PARVO 2400 TRUE ONE METABOLIC SYSTEMS

K.R. Cochrane, S.E. Gaskill, FACSM

University of Montana, Missoula, MT

During the development of a new fitness test for Wildland Firefighting, we needed to compare laboratory VO2 testing using a Parvo medics 2400 True One metabolic cart with field data collected with a Cosmed K4b2 system. The field test VO2 data were consistently slightly higher than the lab data at identical work rates during 20 kg load carriage. PURPOSE: To examine the validity of the Cosmed with the Parvo metabolic system and the ASCM equations. METHODS: Thirty subjects (17 male; 13 female) participated in the study. Upon arrival to the lab, subjects were outfitted with a 20kg. backpack and performed a five-minute warm up at a self-selected intensity. Subjects then completed two identical five-minute steady state stages while wearing the backpack. Each stage was randomly selected for monitoring order with the Cosmed and Parvo system. Subjects walked on a treadmill at an assigned speed between 2-3.5 MPH (mean=3.1 ± 0.4 MPH) and grade between 3-9% (mean=6.0 ± 2.5%). VO2, Ve and O2 extraction data using the Cosmed or Parvo metabolic systems and estimated VO2 (ACSM prediction equations) were analyzed using a one-way repeated measures ANOVA or dependent t-tests (for comparisons of Ve and O2 extraction). Significance was established at p<0.05. RESULTS: The Cosmed measured a higher VO2 compared to the Parvo and ACSM equations (27.5 ± 5.7, 25.4 ± 5.6, and 25.5 ± 5.5 ml•kg-1•min-1, respectively, p<0.05). The Ve for Cosmed was higher compared to the Parvo (44.4 ± 14.3 vs. 40.6 ± 13.4 L•min-1, respectively, p<0.05). There was no difference between the Cosmed or Parvo for percent expired 02. CONCLUSION: Although the Cosmed VO2 and Ve values were slightly higher than the Parvo values, the differences were small and within a reasonable range for energy expenditure estimation in a field vs. laboratory setting. We are currently validating Ve in the two systems.

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