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Fig. 7. Phase shift (A), %Recovery (B) and %Congruity (C) as a function of forward speed. Walking (open circles) was considered to occur when the phase shift between horizontal kinetic energy (Ek) and gravitational potential energy (Ep) of the center of mass (COM) was out-of-phase or near 180°; running (filled circles) was considered to occur when the phase shift between the Ek and Ep of the COM was in-phase or near 0°. Those trials during which the phase shift was neither in- nor out-of-phase were categorized into an intermediate gait (crosses). (B) %Recovery generally decreased with speed. (C) %Congruity increased with forward speed and generally showed a similar separation as %Recovery with respect to walking and running mechanical trials.





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