Prediction of Oxygen Uptake on a Bicycle Wind-Loaded Simulator

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Abstract
The primary purpose of this study was to determine the accuracy of estimating oxygen uptake (.ovrhdot.VO2) from the flywheel revolution rate of a bicycle wind-loaded simulator. .ovrhdot.VO2 at four different flywheel revolution rates was measured on a Findlay Road Machine (FRM). Ten male trained cyclists, 10 male untrained cyclists, 10 female untrained cyclists and 10 female untrained cyclists served as subjects. Significant curvilinear relationships (P < 0.01) were found between road speed estimated from flywheel revolution rate and .ovrhdot.VO2 expressed as 1 .cntdot. min-1, ml .cntdot. kg-1 .cntdot. min-1, l .cntdot. min-1 .cntdot. m-2 (r = 0.97, 0.96, 0.98, respectively). The absolute standard error of the mean .ovrhdot.VO2 was 0.21 l .cntdot. min-1 (9.6%), 3.71 ml .cntdot. kg-1 .cntdot. min-1 (11.5%) and 0.10 l .cntdot. min-1 .cntdot. m-2 (7.9%), respectively. The relationship between .ovrhdot.VO2 and speed was similar to that reported during road cycling. To determine the magnitude of between-machine differences in .ovrhdot.VO2, six subjects randomly performed cycling using two different FMR. Significant (P < 0.05) differences between machines were found at only the highest speed. The present study indicates that it is possibly to accurately predict .ovrhdot.VO2 from flywheel revolution rate using a FRM. Since the FRM appears to approximate the resistance a cyclist experiences on the road and allows cyclists to use their own bicycle, it provides a good alternative to traditional laboratory ergometers.

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