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Fig. 9. Principal component analysis of muscle activity duration, relative onset of
muscle activity and electromyographic (EMG) burst intensity of all intrinsic
caudal muscles except the red axial myomeres during kick-and-glide (red
triangles), braking (white diamonds) and backing maneuvers (green squares),
and normal swimming at 1.2 L s–1 (black circles)
(Flammang and Lauder, 2008).
Each point represents one sequence in which all caudal muscle activity is
measured for a given swimming behavior. Further explanation of principal
component loadings (Table 1)
are given in the text.
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