Rhythm perturbations in acoustically paced treadmill walking after stroke.

Area of Science:

• Neurorehabilitation
• Gait Biomechanics
• Auditory-Motor Integration

Background:

• Acoustic rhythms are utilized in rehabilitation to enhance post-stroke gait.
• Acoustic cueing can improve gait coordination and adaptability to environmental changes.

Purpose of the Study:

• To assess auditory-motor synchronization stability and adaptability in stroke patients during treadmill walking with acoustic pacing.
• To compare synchronization in single-metronome and double-metronome conditions.

Main Methods:

• Eleven stroke patients and 10 healthy controls walked on a treadmill under no metronome, single-metronome, and double-metronome conditions.
• Auditory-motor synchronization stability was measured by phase relation variability.
• Adaptations to perturbed acoustic rhythms were quantified.

Main Results:

• Double-metronome pacing resulted in more stable synchronization than single-metronome pacing for both groups.
• Stroke patients showed weaker footfall-to-beat coupling compared to controls.
• Stroke patients struggled to accelerate steps, preferring slower responses to restore synchronization after perturbations.

Conclusions:

• Pacing both footfalls with acoustic rhythms may be more effective in gait rehabilitation.
• Rhythm perturbations can evaluate auditory-motor synchronization stability and train gait adaptations in neurorehabilitation.