AUTHOR=Tsekouras Yiannis E. , Tambalis Konstantinos D. , Sarras Stavros E. , Antoniou Athanasios K. , Kokkinos Peter , Sidossis Labros S. 

TITLE=Validity and Reliability of the New Portable Metabolic Analyzer PNOE

JOURNAL=Frontiers in Sports and Active Living

VOLUME=1

YEAR=2019

URL=https://www.frontiersin.org/journals/sports-and-active-living/articles/10.3389/fspor.2019.00024

DOI=10.3389/fspor.2019.00024

ISSN=2624-9367

ABSTRACT=<p>Assessment of the oxygen and carbon dioxide content of expired air during exercise is critical for determining cardiorespiratory status. The purpose of this study was to compare the new portable metabolic analyzer PNO<overline>E</overline> with COSMED – Quark CPET, a previously validated stationary metabolic cart.</p><p><bold>Methods:</bold> A total of 22 subjects (17 male and 5 female) aged 32.3 ± 11.1 years took part in the study. Breath by breath gas exchange was measured by both devices during a four-stage incremental protocol on a cycle ergometer. On a separate day, 10 participants repeated the trial to assess the reliability of the PNO<overline>E</overline> metabolic cart.</p><p><bold>Results:</bold> Strong correlations were obtained in VO<sub>2</sub> (<italic>r</italic> = 0.98, <italic>p</italic> &lt; 0.001), VCO<sub>2</sub> (<italic>r</italic> = 0.98, <italic>p</italic> &lt; 0.001), VE (<italic>r</italic> = 0.98, <italic>p</italic> &lt; 0.001), and RQ (<italic>r</italic> = 0.91, <italic>p</italic> &lt; 0.001), between the two devices. Bland-Altman plots revealed a mean difference of 34.0 ± 118 ml/min and 36.4 ± 110 ml/min in VO<sub>2</sub> and VCO<sub>2</sub> analysis, respectively. There were no significant differences in VO<sub>2</sub>, VCO<sub>2</sub>, VE, or RQ between the two devices. Intraclass correlation coefficient was high between the two trials for VO<sub>2</sub> (<italic>r</italic> = 0.98, <italic>p</italic> &lt; 0.001), VCO<sub>2</sub> (<italic>r</italic> = 0.98, <italic>p</italic> &lt; 0.001), VE (<italic>r</italic> = 0.99, <italic>p</italic> &lt; 0.001), and RQ (<italic>r</italic> = 0.93, <italic>p</italic> &lt; 0.001).</p><p><bold>Conclusions:</bold> Our data indicate that the portable metabolic cart PNO<overline>E</overline> can accurately determine respiratory gases over a wide range of exercise intensities, in healthy individuals, in a controlled laboratory setting.</p>