Configuration for 0773 resulting in right leg flexion.
knee extension
Left leg muscles are depicted in black and right leg muscles in gray. Both plots occurred simultaneously but have been separated to better visualize different effects of voluntary effort between legs. At 1.3 mA, bilateral muscle activity was induced. However, when the participant volitionally attempted to flex his right leg, muscle activity decreased in some left leg muscles (VL, RF, and HS) while increasing or bursting in right leg muscles (RF, TA, HS, and MG). Hz hertz (stimulation frequency), µs microseconds, L left, R right, VL vastus lateralis, RF rectus femoris, TA tibialis anterior, HS hamstrings, MG medial gastrocnemius, sec seconds, µv microvolts.The participants’ ability to volitionally generate isometric knee extension torque in a seated position was tested using the configurations that induced or enabled knee extension in supine. Testing took place 12 weeks (0772) or 5 weeks (0773) after permanent implantation. Detailed peak voluntary torque methods are described in the 