Category Archives: 1970s

Metabolimeter, Kofranyi-Michaelis, 1971

Metabolimeter_Kofranyi_Michaelis_1971

From Consalazio CF, Energy expenditure studies in military populations using Kofranyi-Michaelis respirometers, The American Journal of Clinical Nutrition, December 1971, page 1432.

“This simplified and compact unit is fairly small, 20 by 27 by 11 cm, weighs 3 kg, and consists of a dry gas meter for measuring the total volume and temperature of expired air. The aliquoting device can eb set to continuously remove 0.3 or 0.6% of each breath of expired air into a 500-ml butyl rubber bag. One important feature is that these aliquots can be taken over fairly long periods of time. These aliquots are analyzed for their CO2 and O2 concentration by conventional procedures and the eventual calculation of energy expenditure.”

Collins Maxi-Modular System, Late 1970’s

Collin_Maxi-Modular

Photograph courtesy of James Sullivan, BA, RPFT, Supervisor, Pulmonary Laboratories, Memorial Sloan-Kettering Cancer Center was taken in 1984.

His description:This system did both ssDLCO and sbDLCO.  It has an N2 analyzer, but this wasn’t working when I started in the lab; we used He equilibration for FRC measurement.  It used a teletype for data input and output (those things put out a lot of heat…), a Data General computer, complete with the front-panel DIP switches, and a HP X-Y recorder. ….. It was a good system to learn on, because while it was “computerized”, you could still write down He readings and perform your own calculations.  The spirometry software (all programs were loaded into the computer through the teletype via a perforated paper tape; loading took about 45 min) was pretty limited, and there were many times I could get more accurate measurements by calculating the tracings off of the kymograph.”

“…the second spirometer bell (on the right) was used for the inspired sbDLCO gas.  The bell on the left was the primary spirometer, where spirometry, He equilibration and the volume measurements for both DLCO tests were done.”