**Introduction**

Since its introduction by Monod and Sherrer the Critical Power model has been applied to the analysis of cycling performances, Weff (the anaerobic capacity) is considered to be a **constant** quantity. However examination of the relationship between the capacity that can be generated from Weff at any given power, described adequately a **non-constant** quantity for Weff.

**Relation between Weff and Power**

Note that the y axis is expressed in Joules or capacity, and the x axis has become Watts or power. The plotted line is the capacity that can be generated from Weff at any given power.

**Relation between Weff and time**

Note that the y axis is expressed in Joules or capacity, and the x axis has become sustainable time. The plotted line is the capacity that can be generated from Weff at any given time to exhaustion.

**Results**

This cyclist has access to his full Weff of 148 kJ for all intensities up to his supercritical power SCP = 444 W. For higher intensities Weff drops dramatically and reduces eventually to 0 at Pmax = 1405 W. For any sustainable time t < Tscp and intensity > SCP the available Weff is much lower than the saturation value. This indicates that for this cyclist any test at sustainable times shorter than Tscp = 20,4 minutes will inevitably lead to anomalously high values of CP and low values of W’.

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