Reliability and validity of the COSMED K5 portable metabolic system during walking
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ORIGINAL ARTICLE
Reliability and validity of the COSMED K5 portable metabolic system during walking Jacob P. DeBlois1 · Lindsey E. White1 · Tiago V. Barreira1 Received: 2 May 2020 / Accepted: 21 September 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Purpose Portable methods for assessing energy expenditure outside the laboratory and clinical environments are becoming more widely used. As such, it is important to understand the accuracy of such devices. Therefore, the purpose was to determine the reliability and validity of the COSMED K5 portable metabolic system. Methods Reliability and validity were assessed in 27 adults (age: 27 ± 5 years; n = 15 women) using a walking protocol. The protocol consisted of a 5-min walk/2-min rest cycle starting at 1.5 mph and increasing in 0.5-mph increments to 4.0 mph. During visit one, participants wore the K5 to assess oxygen consumption ( V̇ O2), carbon dioxide production ( V̇ CO2), and other metabolic variables. Two to seven days later, the protocol was repeated twice with the COSMED K5 and K4b2 systems in a randomized, counterbalanced order. Results Intraclass correlation coefficients (ICC) revealed that the K5 reliably measured V̇ O2 (ICC 0.64–0.85) and V̇ CO2 across all walking speeds (ICC 0.50–0.80), with stronger reliability at faster walking speeds compared with slower speeds. Moderate-to-strong relationships were observed for measured gases between the K5 and K 4b2. Specifically, V̇ O2 exhibited a moderately high-to-high relationship between devices (r = 0.72–0.82), and a similarly moderately high-to-high relationship was observed for V̇ CO2 (r = 0.68–0.82). While there were no differences in V̇ O2 measured between devices (p ≥ 0.10), the K5 provided lower V̇ CO2 readings than the K4b2 during the 3.0, 3.5, and 4.0 mph walking speeds (p ≤ 0.02). Conclusions The K5 provided reliable and valid measures of metabolic variables, with greater reliability and validity at faster walking speeds. Keywords Consistency · Accuracy · Metabolic gases · Physical activity Abbreviations ANOVA Analysis of variance CV Coefficient of variation EE Energy expenditure ICC Intraclass correlation coefficient METs Metabolic cquivalents RER Respiratory exchange ratio V̇ e Minute ventilation V̇ CO2 Carbon dioxide production V̇ O2 Oxygen consumption
Communicated by Klaas R Westerterp. * Tiago V. Barreira [email protected] 1
Department of Exercise Science, Syracuse University, 820 Comstock Ave, Syracuse, NY 13210, USA
Introduction Oxygen consumption ( V̇ O2) and carbon dioxide production ( V̇ CO2) are common metabolic metrics used to assess cardiovascular function, determine fitness, design training programs for athletes, and can be used in clinical settings. Oftentimes, such metabolic variables are determined using a stationary metabolic cart; therefore, testing for V̇ O2 and V̇ CO2 are often limited to treadmill walking and running or stationary cycling set within the confines of a clinical or laboratory setting. Within the last few decades, por
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