Visual perturbation training to reduce visual dependency in Parkinson's disease: A randomized controlled trial

Area of Science:

• Neurology
• Rehabilitation Science
• Movement Disorders

Background:

• Parkinson's disease (PD) is characterized by reduced gait automaticity and increased reliance on visual cues, contributing to falls.
• Visual dependency in PD can be a significant factor in gait instability and fall risk.

Purpose of the Study:

• To investigate the efficacy of visual perturbation training (VPT) in reducing visual dependency during treadmill walking in individuals with Parkinson's disease.
• To assess the impact of VPT on gait parameters and fall incidence in PD patients.

Main Methods:

• A randomized controlled trial involving 25 early-to-mid-stage PD patients without regular freezing of gait.
• Participants were assigned to either a visual perturbation group or a treadmill training-only control group for 6 weeks, training twice weekly.
• VPT involved treadmill walking with virtual reality-based visual perturbations (rotations and translations); primary outcome was visual dependency.

Main Results:

• Visual perturbation training significantly decreased visual dependency (p < 0.001) and improved temporal gait parameters, including step time, stride time, and cadence, compared to controls.
• No significant improvements were observed in gait speed, step width, step length, or self-reported falls.
• A negative correlation was found between improvements in visual dependency and disease progression (p = 0.004), indicating greater benefit in earlier disease stages.

Conclusions:

• Visual perturbation training is effective in reducing visual dependency and enhancing temporal gait characteristics in individuals with Parkinson's disease.
• Individuals in earlier stages of Parkinson's disease may experience greater benefits from visual perturbation training.
• Further research is warranted to explore the long-term effects and broader applicability of VPT in PD management.