Planned stopping in people with Parkinson

Area of Science:

• Neuroscience
• Biomechanics
• Human Movement Science

Background:

• Gait termination is crucial for mobility and fall prevention.
• Parkinson disease (PD) is associated with gait disturbances, including difficulties with stopping.
• Understanding the pathophysiology of stopping deficits in PD is essential for targeted interventions.

Purpose of the Study:

• To quantify gait termination parameters in people with Parkinson disease (PwP).
• To investigate the impact of secondary motor tasks on gait termination in PwP.
• To elucidate the central control mechanisms underlying planned stopping in PD.

Main Methods:

• Comparative analysis of spatio-temporal gait data between 14 PwP and 14 age/gender-matched controls.
• Four walking tasks were assessed: preferred walk, preferred walk with a secondary motor task, planned stop, and planned stop with a secondary motor task.
• Gait characteristics during steady-state walking and stopping phases were analyzed.

Main Results:

• PwP demonstrated shorter step length and slower speed but similar cadence compared to controls.
• Both groups reduced step length and speed during secondary tasks.
• In planned stops, PwP required more steps and longer duration but achieved similar stopping distance as controls.
• Secondary tasks did not affect stopping distance or step count but increased stopping time in controls.

Conclusions:

• Central control mechanisms regulating planned gait termination appear intact in individuals with mild to moderate Parkinson disease.
• Gait termination strategies differ between PwP and controls, particularly in the temporal domain.
• Further research may explore subtle deficits or compensatory strategies in gait termination in PD.