F waves and motor unit size
| Autor: | Kai Wohlfahrt, Andon Kossev, R. Dengler, Josef Elek, Margot Schubert, Werner Wolf |
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| Rok vydání: | 1992 |
| Předmět: |
Adult
Male Contraction (grammar) Physiology Action Potentials Electromyography F wave Cellular and Molecular Neuroscience Physiology (medical) medicine Humans Microstimulation Twitch force Motor Neurons Physics medicine.diagnostic_test Muscles Anatomy Middle Aged Axons Twitch contraction Motor unit Electrophysiology Female Neurology (clinical) Neuroscience Muscle Contraction |
| Zdroj: | Muscle & Nerve. 15:1138-1142 |
| ISSN: | 1097-4598 0148-639X |
| DOI: | 10.1002/mus.880151013 |
| Popis: | M responses and twitch contractions were evoked in single motor units (MUs) of the first dorsal interosseus muscle by intramuscular microstimulation of motor axons. Two-hundred nine MUs were studied in 21 subjects. Thirty-five MUs (17%) showed F waves in addition to M responses. Twitch force was used to provide an indirect measure of MU size; additionally, twitch contraction time was measured. There was no select group of MUs generating F waves with regard to the above contraction parameters. However, four of five MUs with very high twitch forces, above 70 mN, generated F waves. We conclude that MUs of all sizes produce F waves with similar probability. Only few MUs with very strong twitch forces, i.e., very large MUs, may be more subject to F-wave production and may be involved in the generation of the so-called repeater F waves. |
| Databáze: | OpenAIRE |
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