A method is described of calibrating the Kofranyi-Michaelis (KM) respirometer under normal laboratory conditions using expired air from a subject exercising in the steady state.
During the calibration procedure the KM is connected to the subject via a valve and respiratory tubing and placed in a large airtight Perspex box from which an outlet tube passes to a Douglas bag. Calibration is made by comparing during a given time the content and volume of expired air in the Douglas bag with that passing through the meter at several different exercise flow rates.
An example of a typical calibration experiment is given.
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