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Erschienen in:
20.03.2019 | Brief Communication
Lack of inter-muscular coherence of axial muscles in Pisa syndrome
Erschienen in: Neurological Sciences | Ausgabe 7/2019
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Background
Pisa syndrome is a lateral deviation of the trunk described in Parkinson’s disease (PD). Its etiology is still unknown; advanced muscular signal analysis techniques, such as inter-muscular coherence, could help clarifying its pathophysiology and suggest therapeutic strategies.
Methods
Fourteen idiopathic PD subjects with a lateral deviation of the trunk of at least 10° were included. Electromyographic (EMG) signal was recorded from bilateral thoracic, and lumbar para-spinal and obliqui externi muscles. The synchronization between EMG right and left side signals was quantified using the magnitude-squared coherence function.
Results
In our sample, coherence (range 0–1) did not exceed 0.3, which indicates a lack of intra-muscular coherence.
Conclusion
This finding is suggestive of a defective muscular fine-tuning, which has been associated with bradykinesia. These data support the hypothesis of PS as a clinical sign of bradykinesia, impacting on therapeutic and rehabilitative options.