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The most common technique used to measure oxygen consumption today is termed open-circuit spirometry.
The method of performing spirometry known as "open circuit" entails the subject inhaling as much air as possible from the surrounding environment, putting the mouthpiece in his or her mouth, and then exhaling either slowly (SVC) or quickly (FVC) until the end-of-test criterion is reached. With devices based on wedge bellows, bell, water seal, or rolling seal cylinder/piston-based volume sensing spirometers, open circuit approach is frequently utilized.
The method of measuring spirometry known as "closed circuit" spirometry involves having the subject place a flow transducer in their mouth, breathe normally for two to three tidal breaths (rest breathing), take a maximal inspiration or expiration through the flow transducer, and then slowly inhale or exhale.
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