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Fig. 1. Theoretical relationships between mass-specific power output (y axis) versus speed (x axis) if (A) mass-specific power output does not limit speed and (B) mass-specific power output limits speed. Different lines represent different loading conditions (Load A < Load B < Load C < Load D). Vmax is defined as the maximal speed the animal can attain under any circumstances; Pmax is defined as the maximal mass-specific power output the animal can attain under any circumstances.