Fig. 6. (A,B) Scatter plots showing the variation in plantaris power output as a function of cycle duration (A) and work (B) for all six individuals. (C,D) Plots for power vs cycle duration (C) and power (D) vs cycle work for frog 5, to exemplify trends seen within individuals. Regression lines for each individual frog were plotted using simple least-squares regression to illustrate general trends in the data. Regression lines that are not statistically significant (tested separately by multiple least-squares regression) are not shown. Solid and broken regression lines (where shown) correspond to data represented by solid circles and open circles, respectively. Partial coefficients of determination (r²) were calculated from partial least-squares regression and path analysis to account for variance explained by interaction between independent variables (see text). For clarity, regression lines are omitted from A.