Comparison of three field methods for measuring oxygen consumption

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Abstract
The Oxylog (OX) and the Kofranyi-Michaelis ( KM) field methods for measuring oxygen consumption ( [Vdot]O2) were compared with the conventional Douglas Bag (DB) technique in standardized walking and lifting work in the laboratory. Subjects comprised six men. According to the mean differences in [Vdot]O2 the OX underestimated ( 41% and 6.4% ) and the KM overestimated (3.8% and 0.8% ) [Vdot]O2in walking and lifting work, respectively. The linear regression equations between the DB and the OX as well as between the DB and the KM revealed a good agreement (r= 0.91-0.99) of the [Vdot]O2values. The OX and the KM are accurate for reliable [Vdot]O2measurements under field conditions. Some practical improvements for the OX use, based on several field studies, are recommended.