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Fig. 6. Normalized, average rectified electromyograms of anterior (R1) and
posterior (R4) red muscle activity (solid black line) along with the upper
limit of the S.E.M. (solid gray line) for all
five trout swimming in uniform flow (A and C; n=20) and
Kármán gaiting (B and D; n=14). Data are shown relative
to one oscillation cycle of the center of mass (COM; gray circles). Mean onset
and offset times of muscle activity (horizontal gray bar) along with their
S.E.M. are shown above each graph, where
applicable. When trout are behind the cylinder (B), R1 onset and offset times
(vertical broken lines) occur relatively earlier in the COM cycle than for
trout swimming in uniform flow (A). (C) Rectified area for R4 during swimming
in uniform flow (n=20) shows delayed onset and offset times relative
to A, indicating the presence of a propagating body wave. (D) By contrast, no
posterior red muscle activity is present when trout Kármán
gait.
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