Fig 3. Individual levels of differences and the 95% limits of agreement between estimations of VO₂ (L · min^-1) calculated from fixed levels of low, middle and high HR from commuter cycling as well as from repeated measurements of HR-VO₂ relations based on three submaximal work rates (model 2).

The y-axes show absolute differences in VO₂ against the mean values of the estimations from the repeated measurements on the x-axes.