Final answer:
The Vmax on the force-velocity graph represents the maximum velocity of muscle shortening.
Step-by-step explanation:
The Vmax on the force-velocity graph represents the maximum velocity of muscle shortening. It is the point at which the muscle is contracting at its fastest speed, beyond which any increase in force will not result in a further increase in velocity. The maximum velocity is determined by factors such as the amplitude of displacement and the stiffness of the muscle system.