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Hand rhythmic tapping and timing in Parkinson's disease
G Yahalom1, E S Simon, R Thorne
1Movement Disorders Unit, Department of Neurology, Tel Aviv Sourasky Medical Center, 6 Weizmann Street, Tel Aviv 64239, Israel.
Parkinsonism & Related Disorders
|March 24, 2004
Summary
Parkinson's disease (PD) patients generally maintain rhythmic hand movements, but the tremor-predominant subtype shows specific pacing disturbances, particularly at faster speeds.
Area of Science:
- Neuroscience
- Movement Disorders
- Biomedical Engineering
Background:
- Parkinson's disease (PD) is often characterized by motor disturbances, including dysrhythmia.
- The underlying mechanisms linking PD motor symptoms and rhythmic impairments remain unclear.
Purpose of the Study:
- To investigate hand tapping rhythm and variability in Parkinson's disease patients.
- To compare rhythmic movement capabilities across different Parkinson's disease subtypes.
Main Methods:
- Fifty-one PD patients and 36 controls performed self-paced and externally paced tapping tasks.
- Patients were subclassified into tremor-predominant (TP), freezing-predominant (FP), and akinetic-rigid (AR) groups.
- Rhythmicity and tap-to-tap variation were analyzed during comfortable, fastest, and metronome-guided tapping.
Main Results:
- No significant differences in comfortable self-paced tapping rate or variability were observed between PD patients and controls.
- PD patients exhibited slower fastest tapping rates than controls, particularly the TP and AR subgroups.
- The TP subgroup showed increased tap-to-tap variation at their fastest rate and a tendency towards hastening with external pacing.
Conclusions:
- Self-paced and externally driven rhythmic tapping are generally preserved in Parkinson's disease patients in their 'on' state.
- Specific rhythmic pacing disturbances are identified in the tremor-predominant subtype of Parkinson's disease.