Force-velocity relationships of control and MyBPC morphants. Data from intact trunk muscles during single twitch contractions of controls (open symbols and bar, n = 6) and MyBPC-2B morphants (black symbols and bar, n = 4). Velocity data were grouped according to afterload, and the mean values are shown in the diagram. A hyperbolic equation (see Results) was fitted to the data and extrapolated to determine the V_max. The inset shows the mean V_max values determined by fitting the equation to data of individual fibers. *, P < 0.05. Data are presented as mean ± SEM.