Walking behavior over multiple obstacles in people with Parkinson's disease

Area of Science:

• Neuroscience
• Biomechanics
• Human Movement Science

Background:

• Obstacle avoidance is crucial for safe mobility.
• Understanding gait adjustments in Parkinson's disease (PD) with multiple obstacles is limited.
• PD affects motor control, potentially impairing complex navigation.

Purpose of the Study:

• To investigate the effects of multiple obstacles on walking behavior in individuals with PD.
• To compare obstacle avoidance strategies between people with PD and healthy controls.
• To identify gait parameters indicative of increased fall risk in complex environments.

Main Methods:

• Nineteen individuals with PD and 19 healthy controls walked across an 8m pathway.
• Gait was analyzed during unobstructed, single-obstacle, and double-obstacle avoidance conditions.
• Dependent variables included support phases, stride duration, and toe clearance during approach and crossing phases.

Main Results:

• People with PD showed reduced single support and increased double support phases in obstacle conditions.
• Both groups increased stride duration during the approach phase in the double-obstacle condition.
• Trailing toe clearance decreased in the double-obstacle condition, suggesting increased tripping risk.

Conclusions:

• Individuals with PD adopt a conservative gait strategy when approaching obstacles.
• Navigating multiple obstacles requires increased information processing and planning time for both PD patients and healthy individuals.
• Reduced leading toe clearance in dual-obstacle scenarios elevates tripping likelihood for all participants.