Laser-Guided Visual Cueing Modulates Spatiotemporal Gait Dynamics During Transitions in Parkinson's

Area of Science:

• Neuroscience
• Biomedical Engineering
• Rehabilitation Science

Background:

• Parkinson's disease (PD) significantly impairs gait, increasing fall risk.
• Gait initiation and termination are particularly challenging phases for people with Parkinson's (PwP).
• Visual cueing strategies are explored to improve gait in PD, but their specific effects on initiation and termination require further investigation.

Purpose of the Study:

• To investigate the impact of real-time laser-guided visual cues on spatiotemporal gait parameters during gait initiation and termination in PwP.
• To determine if laser cues enhance dynamic stability and propulsion during gait initiation.
• To explore the differential effects of laser cueing on gait initiation versus termination.

Main Methods:

• Fifteen PwP walked a 5-m path under both uncued and laser-cued conditions.
• Gait kinematics and center of pressure (CoP) data were collected during walking trials.
• Analysis focused on spatiotemporal parameters, dynamic stability measures (lateral asymmetry, fractal dimension), and CoP displacement during gait initiation and termination.

Main Results:

• Laser-guided visual cues significantly increased anterior-posterior CoP displacement during the propelling phase of gait initiation (p = .016).
• Cueing improved dynamic stability, reducing lateral asymmetry (p = .007) and decreasing lateral gait variability (p = .001).
• Step time increased (p = .005) and step velocity decreased (p < .001) with cueing; step length was unchanged. No significant effects were found during gait termination.

Conclusions:

• Laser-guided visual cues enhance gait initiation in PwP by promoting propulsion and stability, potentially through external focus and improved anticipatory postural adjustments.
• The findings suggest laser cueing is a promising intervention for improving functional mobility in PwP, especially during gait initiation.
• The lack of effect on gait termination may indicate differing neural control mechanisms for this phase of gait.