Postural motor programming in paraplegic patients during rehabilitation

Area of Science:

• Neuroscience
• Rehabilitation Medicine
• Biomechanics

Background:

• Regaining sitting posture control is crucial for thoracic spinal cord injured (SCI) patients.
• This requires adapting motor programming for new postural strategies.
• Understanding the time course of these adaptations is key for effective rehabilitation.

Purpose of the Study:

• To investigate the time course of postural reorganization in thoracic SCI patients during rehabilitation.
• To examine changes in motor programming for sitting balance control in different SCI levels.
• To compare adaptation strategies between low and high thoracic SCI patients.

Main Methods:

• Two groups of complete thoracic SCI patients (low vs. high level) were studied.
• Postural control was assessed via a bimanual reaching task with systematic perturbations.
• Visual precues indicated reaching distance (postural perturbation grade) in a reaction time (RT) task.

Main Results:

• Reaction times (RTs) for balance-perturbing movements decreased over the rehabilitation period for both groups.
• Low thoracic SCI patients were consistently slower in movement programming than high thoracic SCI patients.
• Differences in RTs based on perturbation grade diminished over time; precue benefit remained constant.

Conclusions:

• Thoracic SCI patients develop new central postural control processes during rehabilitation.
• Low thoracic SCI patients employ more complex, slower-to-program balance strategies due to residual function.
• High thoracic SCI patients utilize simpler strategies, likely involving more passive postural support.