Estimating motor-unit architectural properties by analyzing motor-unit action potential morphology
| Autor: | Zoia C. Lateva, Kevin C. McGill |
|---|---|
| Rok vydání: | 2001 |
| Předmět: |
Needle electrode
Motor unit action potential Action Potentials Isometric exercise Electromyography Biology Biceps Isometric Contraction Physiology (medical) medicine Humans Computer Simulation Muscle Skeletal Electrodes Motor Neurons medicine.diagnostic_test Anatomy Evoked Potentials Motor Sensory Systems Tendon Motor unit Electrophysiology medicine.anatomical_structure Neurology Neurology (clinical) |
| Zdroj: | Clinical Neurophysiology. 112:127-135 |
| ISSN: | 1388-2457 |
| DOI: | 10.1016/s1388-2457(00)00495-8 |
| Popis: | Objective : We investigated the architectural organization of groups of neighboring motor units (MUs) in normal brachial biceps and tibialis anterior muscles by analyzing morphological landmarks of their MU action potentials (MUAPs). Methods : EMG signals containing multiple MUAPs were recorded using a monopolar needle electrode during moderate isometric voluntary contractions. The MUAPs were identified using computer-aided decomposition, and averaged. For each MUAP the onset, spike, terminal wave, and slow afterwave were identified; then the location of the MU's endplate and muscle/tendon junction were estimated from the latencies of the spike and terminal wave with respect to the MUAP onset. Results : The analysis revealed a variety of architectural organizations, including single and multiple endplate zones, MU fractions, pennation, intramuscular aponeuroses, and centrally and non-centrally located endplates. Conclusions : This type of morphological analysis of the MUAP promises to be informative for studying normal MU properties as well as evaluating MU reorganization in disease. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect