Breath-by-breath CPET systems demonstrated larger errors in oxygen uptake and carbon dioxide production and were less stable across different minute ventilation values than mixing chamber systems.
Does a breath-by-breath CPET system differ in accuracy and precision compared to a mixing chamber system?
Mixing chamber CPET systems demonstrate smaller errors in gas exchange measurements and greater stability than breath-by-breath systems.
Cardiopulmonary exercise testing (CPET) has become an important diagnostic tool for patients with cardiorespiratory disease and can monitor athletic performance measuring maximal oxygen uptake Formula: see textVo2(; max). The aim of this study is to compare the accuracy and precision of a breath-by-breath and a mixing chamber CPET system, using two methods. First, this study developed a (theoretical) error analysis based on general error propagation theory. Second, calibration measurements using a metabolic simulator were performed. Error analysis shows that the error in oxygen uptake (Formula: see textVo2) and carbon dioxide production (Vco2Formula: see text) is smaller for mixing chamber than for breath-by-breath systems. In general, the error of the flow sensor Formula: see textδV, the error in temperature of expired air δT(B) and the delay time error δt(delay) are significant sources of error. Measurements using a metabolic simulator show that breath-by-breath systems are less stabile for different values of minute ventilation than mixing chamber systems.
Beijst et al. (Wed,) reported a other. Breath-by-breath CPET system vs. Mixing chamber CPET system was evaluated on Accuracy and precision of oxygen uptake and carbon dioxide production. Breath-by-breath CPET systems demonstrated larger errors in oxygen uptake and carbon dioxide production and were less stable across different minute ventilation values than mixing chamber systems.