![]() Moderate-to-strong relationships were observed for measured gases between the K5 and K4b 2. Intraclass correlation coefficients (ICC) revealed that the K5 reliably measured O 2 (ICC 0.64-0.85) and CO 2 across all walking speeds (ICC 0.50-0.80), with stronger reliability at faster walking speeds compared with slower speeds. Two to seven days later, the protocol was repeated twice with the COSMED K5 and K4b 2 systems in a randomized, counterbalanced order. During visit one, participants wore the K5 to assess oxygen consumption (O 2), carbon dioxide production (CO 2), and other metabolic variables. 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. Reliability and validity were assessed in 27 adults (age: 27 ± 5 years n = 15 women) using a walking protocol. Therefore, the purpose was to determine the reliability and validity of the COSMED K5 portable metabolic system. As such, it is important to understand the accuracy of such devices. Portable methods for assessing energy expenditure outside the laboratory and clinical environments are becoming more widely used. ![]()
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February 2023
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