Key result
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.
Why the study?
Does a breath-by-breath CPET system differ in accuracy and precision compared to a mixing chamber system?
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.
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Breath-by-breath CPET may yield larger errors; leaves open validation against mixing chambers in human studies.
Beijst et al. (2012) studied this question. 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.
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