Fig. 4

Mean and variability for Peak Lateral Center-of-mass Speed and Lateral Center-of-mass Excursion. Variability of peak lateral center-of-mass speed and lateral center-of-mass excursion during the transition period for Transition trials and corresponding time periods for Null trials. Participants with iSCI showed significantly more variability in (a) peak lateral center-of-mass (COM) speed per stride and (b) lateral COM excursion per stride during Transition 1 but decreased variability to Null trial levels with repetitions of transitions, demonstrating savings in control performance. Non-impaired participants did not change (c) lateral COM speed variability and significantly increased (d) variability of lateral COM excursion, showing worse control performance with repetitions of transitions. Trials: N1 = Null 1, T1 = Transition 1, T2 = Transition 2, T3 = Transition 3, N2 = Null 2