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Fig. 3. The normalized ratio (see Materials and methods) between maximal downward
and upward velocities attained at each step by the centre of mass of the body
is plotted as a function of the running speed. The greater vertical velocity
attained during the downward displacement indicates: (i) a lower vertical
force exerted by the structures supporting the body at the lowest speeds when
the aerial phase is nil, together with (ii) a ballistic fall greater than the
ballistic lift at higher speeds (Fig.
2). Statistics as in Fig.
2.
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