Πλοήγηση ανά Συγγραφέας "Kantaras, Paraskevas"

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  • Μικρογραφία εικόνας
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    The reliability of the VYNTUS CPX.
    (Τ.Ε.Ι. Κρήτης, Σχολή Τεχνολογίας Γεωπονίας και Τεχνολογίας Τροφίμων (Σ.Τε.Γ.Τε.Τ), Τμήμα Διατροφής και Διαιτολογίας, 2018-07-16) Kantaras, Paraskevas; Κανταράς, Παρασκευάς
    The purpose of this study was to assess for the first time the reliability of a new indirect calorimeter, the Vyntus CPX in measuring O2 consumption and CO2 production to estimate resting metabolic rate (RMR) and to assess the effect of not calibrating on its reliability. Twenty four healthy adults (12 males and 12 females) were measured four times with the indirect calorimeter Vyntus CPX in canopy mode in the morning for two consecutive days (2 measurements each day). Each measurement lasted 20 minutes in which the first 5 minutes were discarded. A standarized protocol was used for all the individuals. Each day before the first measurement the device was warmed up for at least 15 minutes, gas and volume calibrated according to the manufacturer’s instructions. The second measurement was randomly carried out after gas and volume calibration on one day and without gas and volume calibration on the other day. Statisticial analysis included non - parametric tests, intraclass correlation coefficients, Bland-Altman plots and calculation of the standard error of the measurement (SEM) for the assessment of reliability. Subjects ranged in age from 19 to 57 years (28.5 ± 11.3 years) and in body mass index from 18.4 to 36.5 (23.8 ± 4.1 kg/m2). Means of RMR were not significantlly different in between days (p = 0.91) and within the same day (p = 0.61). In between days, the intraclass correlation coefficient of RMR was questionable (r = 0.78), but a good intraclass correlation coefficient of RMR was found (r = 0.83) within the same day. However, high limits of agreement and high SEM were found for RMR in between days (± 476 kcal∙day-1, SEM = 183 kcal∙day-1) and within the same day (± 435 kcal∙day-1, SEM = 156 kcal∙day-1). Similar results were found for VO2 and VCO2 in between days and within the same day respectively. At last, means of RMR were not significantlly different comparing the calibrated and not calibrated measurements within the same day (p = 1.00). The intraclass correlation coefficient of RMR showed good correlation (r = 0.82). In addition, good correlation was found for VO2, but questionable for VCO2. However, high limits of agreement and high SEM were found for RMR (± 417 kcal∙day-1, SEM = 146 kcal∙day-1 respectively). High limits of agreement and high SEM were indicated for the variables VO2 and VCO2 as well. The variables VO2, VCO2 and RMR were not significantly different in between days and within the same day. However, the high limits of agreement and the SEM of VO2, VCO2 and RMR on the three reliability tests indicate low realibility of the Vyntus CPX in measuring O2 consumption, CO2 production and estimating RMR in healthy individuals. Furthermore, our results do not show an effect of calibration before each measurement indicating that calibration before each measurement is not beneficial in providing more reliable VO2, VCO2 and RMR results, although it is still preferable to calibrate between each measurement.