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Fig. 7. Patterns of strain in the biceps (A) and vastus (C) during walking,
trotting and galloping from three strides to show characteristic length-change
trajectories during different gaits. Idealized strain trajectories are shown
for the biceps (B) and vastus (D). In the biceps, strain trajectories can be
divided into three discrete phases; in the vastus, four discrete phases are
defined (described in more detail in the text). Dark gray shading represents
the stance phase; light gray shading represents the swing phase.