Proactive Locomotor Adjustments Are Specific to Perturbation Uncertainty in Below-Knee Prosthesis Users.

摘要: Sensory-motor deficits associated with below-knee amputation impair reactions to external perturbations. As such, prosthesis users rely on proactive control strategies maintain locomotor stability. However, there are trade-offs (metabolic, comfort, etc.) strategies. We hypothesize that because costly, and non-impaired participants will use a priori knowledge (timing, direction) of an impending lateral perturbation make specific gait adaptations only when the timing is known the adaptation can be temporally-limited. This hypothesis was partially supported. When predictable, users, their impaired side, increased margin stability during steps immediately preceding direction either unknown or directed towards side. strategy should reduce likelihood requiring corrective step neither group exhibited substantial compared baseline walking unpredictable, independent knowledge. The absence further stabilization behaviors observed in anticipation certain but temporally unpredictable may responsible for balance control.