Respiratory calorimeter
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United States of America Patent
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-
Sep 9, 2003
Grant Date -
Jul 18, 2002
app pub date -
Oct 29, 2001
filing date -
Mar 17, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An indirect calorimeter for measuring the subject's oxygen consumption per unit time employs a mouthpiece through which the subject breathes for a period of time. Conduits connect the mouthpiece to a flow meter and a capnometer so that the subject's inhalations and exhalations pass through the flow meter and the exhalations also pass through the capnometer. Electrical signals from the flow meter and capnometer are provided to a computer which calculates the CO.sub.2 exhaled by the subject during the test by integrating the instantaneous CO.sub.2 content of an exhalation as measured by the capnometer over the volume as measured by the flow meter and subtracts that quantity from the exhaled volume and subtracts their difference from the inhaled volume. In alternative embodiments the system can also measure the subject's Cardiac Output and Delivered Oxygen.
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