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. Author manuscript; available in PMC: 2009 Jan 1.
Published in final edited form as: J Biomech. 2007 Aug 17;41(1):137–144. doi: 10.1016/j.jbiomech.2007.07.011

Fig. 1.

Fig. 1

Experimental Setup. (a) The lower extremity was supported on air bearings that allowed near frictionless motion in the sagittal plane. Pelvis motion was restricted by a dual brace, padded restraint. An electrical stimulator delivered a pulse train to the rectus femoris, the vastus medialis or both muscles simultaneously. Reflective markers were used to measure the induced lower extremity kinematics via an 8-camera motion capture system. (b) Compliant springs, attached to fixed load cells, were used to hold the limb in a desired posture prior to stimulation.