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Fig. 7. Multiple linear regression model showing the relationship between lateral head amplitude and R1 muscle activity variables for trout swimming in uniform flow (black circles) and Kármán gaiting (blue circles). Circle diameters are scaled to illustrate the relati ve magnitude of muscle intensity. During swimming in uniform flow, head amplitude has a significant slope when plotted against burst duration and relative onset time (r2=0.68, P<0.05, n=20). Actual three-dimensional relationships of the data are plotted, along with corresponding two-dimensional deconstructions, on either side to facilitate interpretation. By contrast, during the Kármán gait, head amplitude is not correl ated to muscle activity (r2=0.22, P=0.65, n=14).





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