Figure 4. Prototypical oxygen consumption curves of one subject for two 60s exhaustive runs with and without a warm-up phase (grey trace: exhaustive run with warm-up, black trace: exhaustive run without warm-up). In order to justify the estimate for the corrected oxygen consumption in the 60s exhaustive run, which is subtracting the mean warm-values from the total oxygen consumption during the exhaustive run, both light grey areas should be approximately equal.