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Fig. 5. The average strain (change in normalized muscle lengths; means ± 1
S.E.M.) of the vastus for the three phases of
stance identified in Fig. 3
(phases 3-5). There was no overall effect of trotting speed. The muscle
contracted concentrically during all three phases and the total concentric
strain during the three phases was greater on an incline (black symbols) than
on the level (gray symbols).