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Fig. 1. Gait diagrams and track diagrams of one anteroposterior sequence (APS) at
different speeds and gaits. Each colour corresponds to one foot: f1,
1-forelimb (red); f2, 2-forelimb (orange); h1, 1-hindlimb (dark green); h2,
2-hindlimb (pale green). On gait diagrams, coloured lines correspond to
stances and coloured crosses represent the next footfall. On track diagrams,
coloured squares indicate the positions of foot contacts on the runway. (A)
APS temporal and spatial parameters [adapted from Abourachid et al.
(Abourachid et al., 2007)].
Time lags, reflecting temporal coordination between forelimbs (fore lag;
FL), hindlimbs (hind lag, HL) or pairs of limbs (pair lag;
PL), are calculated as a percentage of f1 cycle duration. Space gaps,
which express spatial coordination between the forelimbs (fore gap;
FG), hindlimbs (hind gap; HG) or pairs of limbs (pair gap;
PG), are expressed as a percentage of f1 stride length. (B) Two
experimental gait (left) and track (right) diagrams for each gait. The two
pairs of gait–track diagrams correspond to low (top) and high (bottom)
speed for the considered gait. For each foot, the duration of the cycle
decreases, whereas stride length increases with increasing speed. The changes
in kinematics and limb coordination support this decrease in cycle duration
and increase in stride length.
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