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Changes in motor unit synchronization following central nervous lesions in man
S F Farmer1, M Swash, D A Ingram
1Department of Physiology, University College and Middlesex School of Medicine, London.
The Journal of Physiology
|April 1, 1993
Summary
Central nervous lesions alter motor unit synchronization, impacting fine motor control. Improved synchronization correlates with better hand function after stroke, suggesting corticospinal tract involvement.
Area of Science:
- Neuroscience
- Motor Control
- Rehabilitation
Background:
- Central nervous system lesions, such as stroke, often impair fine motor control.
- Understanding the neural mechanisms underlying motor control deficits is crucial for effective rehabilitation.
Purpose of the Study:
- To investigate motor unit synchronization in patients with unilateral central nervous lesions.
- To correlate changes in motor unit synchronization with clinical status and fine motor function.
Main Methods:
- Recorded single motor unit spike trains during voluntary isometric contraction in affected and unaffected hand muscles.
- Performed cross-correlation analysis on motor unit spike trains to assess synchronization.
- Related cross-correlogram peak properties to clinical state and hand function.
Main Results:
- Central nervous lesions altered motor unit synchronization (narrowing or broadening).
- Changes in synchronization were linked to common excitatory postsynaptic potentials (EPSPs) and presynaptic synchronization.
- Improved motor unit synchronization correlated with enhanced fine motor control and faster finger movements post-stroke.
Conclusions:
- Motor unit synchronization is influenced by corticospinal tract function.
- Altered synchronization patterns reflect changes in presynaptic inputs to motoneurones after central nervous damage.
- Motor unit synchronization serves as a potential biomarker for motor recovery and functional improvement.