Comparing aftereffects after split-belt treadmill walking and unilateral stepping

Area of Science:

• Biomechanics
• Motor Control
• Rehabilitation Science

Background:

• Step length asymmetry is a common gait impairment in orthopedic and neurologic conditions.
• Effective rehabilitation strategies are needed to address this asymmetry and improve walking function.

Purpose of the Study:

• To compare the magnitude of step length aftereffects following split-belt treadmill (SBT) walking versus unilateral stepping.
• To investigate kinematic patterns associated with these aftereffects during gait rehabilitation.

Main Methods:

• Healthy adults performed overground gait trials before and after walking on a split-belt treadmill (SBT) or during slow/fast unilateral stepping.
• Step length asymmetry was quantified to assess aftereffects.
• Lower extremity kinematics were analyzed during treadmill conditions.

Main Results:

• Split-belt treadmill (SBT) walking resulted in significantly greater step length asymmetry aftereffects compared to both slow and fast unilateral stepping.
• Increased hip, knee, and ankle flexion in the stationary limb during fast unilateral stepping correlated with larger step length aftereffects.

Conclusions:

• Acute split-belt treadmill (SBT) walking induces more significant gait aftereffects than unilateral stepping.
• While both interventions alter gait, SBT walking shows a stronger carryover effect.
• Optimal unilateral stepping for maximizing aftereffects involves active limb extension rather than passive movement.