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Original articles  EXERCISE PHYSIOLOGY AND BIOMECHANICS


The Journal of Sports Medicine and Physical Fitness 2003 June;43(2):150-5

Copyright © 2009 EDIZIONI MINERVA MEDICA

language: English

Comparative analysis of the Cosmed Quark b2 and K4b2 gas analysis systems during submaximal exercise

Eisenmann J. C., Brisko N., Shadrick D., Welsh S.

Division of Kinesiology and Health, University of Wyoming, Laramie, WY, USA


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Aim. The pur­pose of ­this ­study was to com­pare the ­Cosmed K4b2 port­able gas anal­ysis ­system ­with the ­Cosmed ­Quark b2 meta­bolic ­cart.
­Methods. ­Twenty-one sub­jects ­attended one ­testing ses­sion ­that con­sisted of dupli­cate meas­ure­ments of gas vol­umes and con­cen­tra­tions ­using ­both ­Cosmed gas anal­ysis ­systems at 3 tread­mill ­work ­rates; 1) 80 m·min-1, 0% ­grade, 2) 80 m·min-1, 5% ­grade, and 3) 80 m·min-1, 10% ­grade. Sub­jects ­walked for 3 min­ at ­each ­rate ­with one of the gas anal­ysis ­systems ­attached to the face­mask. The ­order of the pro­ce­dures was ran­dom­ized so ­that one ­system was ­used ­during ­both ­phases (­1st or 2nd) of ­each ­work ­rate.
­Results. The ­results indi­cated ­that ­oxygen con­sump­tion (VO2) was sig­nif­i­cantly ­higher in the K4b2 com­pared to the ­Quark at 80 m·min-1, 0% ­grade (14.3±1.2 vs 13.6±1.2 ml·kg-1·min-1, respec­tively), (p<0.01). The frac­tional con­cen­tra­tion of ­oxygen in ­expired air was ­also sig­nif­i­cantly ­lower in the K4b2 at 80 m·min-1, 0% ­grade and 80 m·min-1, 10% ­grade (p<0.05). ­There ­were no sig­nif­i­cant dif­fer­ences ­between ­systems for ­minute ven­ti­la­tion or ­carbon ­dioxide pro­duc­tion. ­Despite the ­small ­mean ­bias in ­mean VO2 ­values (0.5-1.0 ml·kg-1·min-1 ­higher) in the K4b2, all indi­vidual ­values ­were ­within the ­limits of agree­ment (­mean dif­fer­ence±2 SD) as deter­mined by the ­Bland-­Altman tech­nique.
Con­clu­sion. The find­ings ­show a min­imal ­bias in res­pir­a­tory and meta­bolic param­e­ters ­during bi-­pedal loco­motor activ­ities at low to mod­erate exer­cise inten­sities in the two gas anal­ysis ­systems.

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