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Fig. 4. Principal component loading scores for PC I and PC II during walking and running for muscles in the quadriceps group. Each point shows the mean ± S.E.M. loading scores pooled from the six subjects (N>342). The 20 points on each graph show the PC loading scores at the 20 successive time-windows during each stride, graded from black immediately after heel-strike to light grey immediately before the next heel-strike. Data are shown for the vastus lateralis (A), the rectus femoris (B) and the vastus medialis (C).





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