The ‘Oxylog’: an evaluation

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Abstract
The Oxylog is a portable instrument designed to measure O2 consumption (.ovrhdot.VO2) of an ambulatory [human] subject. Steady-state measurements were made with an Oxylog, of inspiratory volume (.ovrhdot.VI) and .ovrhdot.VO2 during bicycle ergometer exercise at work rates ranging from 30-150 W. These measurements were compared to simultaneous measurements of expiratory volume (.ovrhdot.VE) and .ovrhdot.VO2 made with a dry gas meter and mass spectrometer. Four experiments were conducted during which 433 comparative measurements were made. In 2 experiments the Oxylog significantly underestimated .ovrhdot.VO2 (by 4.4 and 5.6%). Averaged over the 4 experiments, the underestimate reduced to 1.5%, which could be accounted for by a respiratory exchange ratio of .apprx. 0.9. There was, overall, no significant difference between .ovrhdot.VI and .ovrhdot.VE. The Oxylog is sufficiently accurate for the reliable determination of .ovrhdot.VO2 and of energy expenditure under field conditions.

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