Discharge properties of single motor units in patients with spinal cord injuries
| Autor: | M. Margaret Wierzbicka, Llewelyn Davies, Allen W. Wiegner, Robert R. Young |
|---|---|
| Rok vydání: | 1993 |
| Předmět: |
medicine.medical_specialty
Physiology Electromyography Biceps Cellular and Molecular Neuroscience Physiology (medical) medicine Humans Spasticity Spinal cord injury Spinal Cord Injuries Paresis Motor Neurons medicine.diagnostic_test business.industry Muscles Motor neuron medicine.disease Motor unit medicine.anatomical_structure Anesthesia Physical therapy Neurology (clinical) medicine.symptom business Muscle Contraction Muscle contraction |
| Zdroj: | Muscle & Nerve. 16:661-671 |
| ISSN: | 1097-4598 0148-639X |
| DOI: | 10.1002/mus.880160613 |
| Popis: | To study neurophysiological correlates of spastic paresis, we analyzed the discharge pattern of single motor units (SMUs) during sustained voluntary contraction from muscles weakened by spinal cord injury (SCI) and from muscle of near normal strength just at or above the level of injury., The average firing rate of SMUs was reduced in patients' biceps brachii and tibialis anterior muscles compared with controls, but not in the triceps brachii. Floating serial correlation coefficients obtained form successive interdischarge intervals were significantly more positive in patients than in controls in all three muscles. One statistical measure of regularity of discharge, akin to a coefficient of variation, was best able to differentiate patient and control SMUs. Increased discharge variability in muscle just above the level of injury suggested that subtle effects of traumatic SCIs were more extended than was clinically apparent. Although consistent statistical differences could be measured, these changes were not specific to SCI, nor were all SMUs equally affected. © 1993 John Wiley & Sons, Inc. |
| Databáze: | OpenAIRE |
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