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Fig. 4. Patterns of activation and strain in the biceps femoris (A) and vastus
lateralis (B) during three strides of slow trotting. Data are from the same
individual trotting at 2.0 m s–1. Dark gray shading
represents the stance phase; light gray shading represents the swing phase.
The biceps remains fairly isometric during the interval in which
electromyographic activity is present in late swing and early stance and then
shortens rapidly and substantially later in stance. The vastus is generally
stretched during much of its activation period early in stance before
shortening late in stance.
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