FIG. 1.

Spinal rules of locomotion applied during body weight–supported treadmill training (BWSTT) in spinal cat (A) and a human with spinal cord injury (B). In (A), a trainer holds the tail to control weight bearing on the left hindpaw while another trainer is starting to assist the right hindlimb. Assistance is applied at the ankle and is timed to occur when the right hip has extended sufficiently to trigger swing. Note the forelimbs are resting on a platform above the treadmill and this creates more of an upright posture. In (B), a similar moment is shown during BWSTT in a human. While one trainer controls weight bearing in the left leg, another trainer is assisting swing in the right leg by manipulating the ankle. The assistance is applied when the hip is extended.