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Velocity modulation and rhythmic synchronization of gait in Huntington's disease
M H Thaut1, R Miltner, H W Lange
1Center for Research in Neurologic Rehabilitation, Colorado State University, Fort Collins 80523, USA.
Insights
Patients with Huntington's disease (HD) can adjust walking speed with cues, but struggle with music synchronization. Gait slowness correlates with disability, not just chorea, indicating a need for targeted interventions.
Area of Science:
- Neuroscience
- Movement Disorders
- Biomedical Engineering
Background:
- Huntington's disease (HD) is a neurodegenerative disorder affecting motor control.
- Gait velocity modulation is crucial for daily activities and can be impaired in neurological conditions.
- Auditory rhythmic cues are used to assess and potentially improve gait in various patient populations.
Purpose of the Study:
- To investigate the ability of Huntington's disease patients to modulate gait velocity.
- To examine gait modulation with and without external sensory cues, including auditory rhythmic cues.
- To assess the impact of disease severity on gait modulation and synchronization abilities.
Main Methods:
- 27 patients with Huntington's disease (HD) participated.
- Gait velocity was assessed during self-paced walking (normal, slow, fast) and rhythmic cueing (metronome, music).
- Rhythmic cues were presented at varying frequencies relative to baseline cadence.
Main Results:
- Patients with HD exhibited slower-than-normal gait velocity across all conditions.
- Gait velocity modulation was significant with self-paced and metronome cues, but not music.
- Gait velocity declined with increased disability and chorea scores; disability score was a better differentiator.
- Synchronization ability was impaired, worsening with disease severity.
- A carry-over effect of improved gait velocity was observed after rhythmic cueing, but not uncued trials.
Conclusions:
- Patients with Huntington's disease retain some ability to modulate gait velocity, even with external rhythmic cues.
- Metronome cueing is more effective than music for gait modulation in HD patients.
- Gait impairment in HD is closely linked to overall disability, highlighting the need for comprehensive management strategies.
- Deficient synchronization and gait slowness underscore the motor control challenges in Huntington's disease.
Abstract:
This study analyzed the ability of patients with Huntington's disease (HD) to modulate gait velocity without external sensory cues and in response to an auditory rhythmic cue within a frequency entrainment design. Uncued gait patterns of 27 patients were first assessed during normal, slower, and faster self-paced walking. During rhythmic trials, metronome and musical beat patterns were delivered at rates 10% slower and 10-20% faster than baseline cadence to cue gait patterns. After the rhythmic trials, patients were retested at normal gait speed without rhythm. Gait velocities in the patients with HD were below normal reference values in all ranges. Patients were able to significantly (p <0.05) modulate their gait velocity during self-paced and rhythmic metronome cueing but not during music. The ability to modulate gait velocity was retained regardless of the severity of the disease. Gait velocity declined with an increase in disability and chorea score. The disability score differentiated better between gait velocity of moderately and severe patients than chorea score. Slowness of gait was significantly correlated only with disability score and not with chorea. Patients had more difficulty producing adequate step rates than stride lengths during normal and fast walking speeds. After the rhythmic trials, unpaced gait velocity remained significantly (p <0.05) higher than baseline. This carry-over effect was not seen after the uncued trials. Synchronization ability was deficient in all patients, deteriorated with severity of disease, and was already compromised in patients with soft disease signs. Rhythmic tracking of music declined more with severity of disease than metronome tracking. In summary, patients were able to modulate velocity with and without external cues. Velocity adaptations to the external rhythm in music and metronome were achieved without exact synchronization between step cadence and rhythmic stimulus.