Example of force-clamp technique and results of tension-velocity and tension-power relationships. A. The force clamp technique relies upon using the force signal as feedback to the muscle length so that a preset force is achieved. The preset force varies from 10-96% and several examples are shown here. B. The resulting length change indicates velocity of contraction at the preset force. Velocity was calculated between 40–60 ms after the change in load. C-D. Tension-velocity and tension-power relationships were similar in HG and nonHG controls.