Abstract
[Purpose] The purpose of this study was to examine the measurement precision of the portable metabolic system (METAMAX 3B) and compare it with that of the stationary metabolic system (AE-310S). [Subjects] Twenty-three healthy young volunteers. [Method] We performed the multistep exercise test twice and measured the oxygen uptake (VO2) and its associated variables, carbon dioxide production (VCO2) and expir atory ventilation (VE) with both METAMAX 3B and AE-310S. Then, we investigated the reproducibility of the METAMAX 3B and AE-310S by comparing their measurements of VO2, VCO2, and VE. [Result] The ICCs of each variable measured by METAMAX 3B and AE-310S were 0.98 for Test1 vs. Test2. Bland-Altman analysis of the METAMAX 3B results showed only fixed bias for VO2 and VCO2, whereas VE showed both fixed bias and proportional bias. [Conclusion] Although METAMAX 3B showed very high ICC in comparison with AE-310S, the results suggest that it generates some systematic bias.
