Fig. 10. Center of mass (CoM) work (filled triangles) and summed limb work (open squares) plotted against acceleration. The slope of the regression line for the summed limb work (broken line) was significantly lower then that for the center of mass work (solid line). Thus, at the maximum accelerations and decelerations, the work done by the limbs did not account for all of the work done on the center of mass. This suggests that the trunk and tail may also be recruited to power changes in speed (see Discussion). Linear regressions are: CoM work, y=0.530x+0.022, r²=0.97, P<0.0001; limb work, y=0.338x+0.328, r²=0.87, P<0.0001.