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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

lingua: Inglese

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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