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Fig. 1. Still frames of a guinea fowl during an unexpected perturbation to
illustrate experimental set-up. The ground force data reported in this paper
were reported previously (Daley et al.,
2006), where they were used to calculate changes in mechanical
energy of the body center of mass (COM). Here, the experimental data were
analyzed further by adding limb kinematics and inverse dynamics to investigate
joint mechanics during the perturbation. A 0.6 m long force plate was placed
at the midpoint of an 8 m long runway and rested 8.5 cm below the runway
surface. White tissue paper pulled tightly across the gap created the
appearance of a uniform substrate. Kinematics and ground reaction forces were
measured through time (moving from frame A to frame B) for the perturbed step.
These data were used to (1) evaluate whole limb mechanics and (2) calculate
joint moments and work using inverse dynamics, as described in Materials and
methods.
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