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Motor excitability in myopathy.
Joachim Liepert1, Benedikt G H Schoser, Cornelius Weiller
1Department of Neurology, University of Hamburg, University Hospital Eppendorf, Martini Strasse 52, D-20246 Hamburg, Germany. liepert@uke.uni-hamburg.de
Summary
Patients with myopathy exhibit altered nervous system excitability, showing reduced motor control and increased motoneuron excitability. These changes affect both affected and unaffected muscles, indicating broader neurological involvement.
Area of Science:
- Neuroscience
- Neuromuscular Disorders
Background:
- Myopathy involves progressive muscle weakness and degeneration.
- The impact of myopathy on central nervous system excitability remains incompletely understood.
Purpose of the Study:
- To investigate alterations in motoneuronal excitability in patients diagnosed with myopathy.
- To determine if central motor pathways are affected in myopathy.
Main Methods:
- Utilized single and paired pulse transcranial magnetic stimulation (TMS) and electrical nerve stimulation.
- Recorded motor-evoked potentials from clinically unaffected and paretic muscles in myopathy patients.
Main Results:
- Myopathic patients demonstrated reduced intracortical inhibition compared to healthy controls.
- Observed enhanced alpha-motoneuron excitability and increased motor-evoked potential amplitudes.
- These neurophysiological changes were evident in both clinically affected and unaffected muscles.
Conclusions:
- Myopathy is associated with altered nervous system excitability.
- Findings suggest motor disinhibition at both cortical and subcortical levels in myopathy patients.