Fig. 6. (A) Summary of the force/velocity results for the seven red fibre bundles (different symbols for different bundles). Force is expressed relative to P₀, the isometric force at L₀, the fibre length at which maximum isometric force was produced, and velocity is expressed relative to maximum shortening velocity V_max. Each fibre bundle's values are expressed relative to its own P₀ and V_max. V_max was found for each fibre bundle by fitting a hyperbola to its force/velocity data as described in the text. The line is the mean of these fitted lines for the seven fibre bundles. (B) The relationship between power and velocity of shortening. The points are the products of the force and velocity values shown in A and the line is the mean of the calculated power curves for the seven fibre bundles. (C) The power for both stretch and shortening. The points are the products of the force and velocity values shown in A. The line for shortening is the same as in B. The line for stretch is a straight line fitted through the points and constrained to pass through the origin.