Fig. 1. Double logarithmic plot of the net energy cost of human running (E_run) versus body mass calculated from the slope method (A) and subtraction method (B) (see Materials and methods for explanation). The shaded circles represent human data from 20 previously published sources (see Table 1A and Table 1B for corresponding data), and the solid circle represents the mean value from these studies. The solid line in A and the broken line in B correspond to E_run predicted from the allometric equation of Taylor et al. (Taylor et al., 1982) (Eqn 1). The solid line in B corresponds to E_run predicted from the new allometric equation from the present study (Eqn 2).