This rig is specifically designed to measure the force of isometric movements in the lower limbs. The rig can be adapted to measure forces during movements such as dorsiflexion, plantarflexion, inversion, or eversion. 

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This rig has been used in conjunction with the sEMG sensor array on amputees to record muscle activity in the intact and residual limbs. This gives a high level understanding of muscle activity during volitional movements.