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A New Method for Calibrating the Kofranyi-Michaelis Respirometer
  1. C. T. M. Davies,
  2. D. S. Shirling
  1. M.R.C. Environmental Physiology Research Unit, London School of Hygiene and Tropical Medicine, Keppel Street, London, W.C.1
  2. The Department of Physiology, University of Edinburgh


    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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