Motor Unit Mu
Mostrando 1-8 de 8 artigos, teses e dissertações.
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1. Mechanism of Muscle Vibrations During Stimulated and Voluntary Isometric Contractions of Mammalian Skeletal Muscle
When a muscle contracts it produces vibrations. The origin of these vibrations is not known in detail. The purpose of this study was to determine the mechanism associated with muscle vibrations. Mechanisms which have been proposed in the literature were described as theories (cross-bridge cycling, vibrating string and unfused motor unit theories). Specific p
Publicado em: 2007
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2. Mathematical modeling and simulation of motor unit action potencials. / Modelagem matemática e simulação de potenciais de ação de unidades motoras.
This work presents the mathematical model and simulation of motor unit action potentials of vertebrate muscles aiming at after simulation of the electromyogram. To obtain this, initially, it was made a compilation of several data about the distribution of muscle fibers (FBs) in motor units (MUs) of many muscles, and the mathematical models of the action pote
Publicado em: 2006
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3. New methods of estimating the number of motor units in a muscle.
Two electrophysiological methods have been described for estimating the number of motor units (MU) in a muscle. The methods are based on the original methods of Mc Comas and others, which involve dividing the maximum compound potential (MCP) of muscle evoked by supramaximal electrical stimulation of nerve by a mean motor unit potential (MMUP). The important
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4. Motor unit regulation of mammalian pharyngeal dilator muscle activity.
The present study examined the cellular regulation of one of the pharyngeal dilator muscles, the geniohyoid, by assessing its motor unit (MU) behavior in anesthetized cats. During spontaneous breathing, MU that (a) were active during inspiration only (I-MU) and (b) were active during both inspiration and expiration (I/E-MU) were identified. I-MU had a later
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5. Some electrical properties of motor units and their effects on the methods of estimating motor unit numbers.
Long train (50) electrical pulses were applied to the ulnar, median, and deep peroneal nerves. The probability of firing, or firing index, of the first motor units (MU) recorded by surface and needle electrodes in the first dorsal interosseous, thenar, and extensor digitorum brevis muscles varied from 0-100% as the stimulus was increased from a minimum thres
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6. Tremor-related motor unit firing in Parkinson's disease: implications for tremor genesis
Muscle tremors reflect rhythmical motor unit (MU) activities. Therefore, the MU firing patterns and synchrony determine the properties of the parkinsonian force tremor (FT) and the neurogenic components of associated limb tremors. They may also be indicative of the neural mechanisms of tremor genesis which to date remain uncertain. We examined these MU behav
Blackwell Science Inc.
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7. The effect of partial denervation of developing rats fast muscles on their motor unit properties.
1. The effects of partial denervation on motor units of the fast twitch extensor digitorum longus (EDL) muscle of the rat were studied. 2. Partial denervation was performed by surgically removing 2-4 mm of the L4 ventral ramus in 3- and 18-day-old Wistar rats. Two to three months later, EMG activity, contractile properties and muscle fibre types were analyse
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8. Excitatory drive to the alpha-motoneuron pool during a fatiguing submaximal contraction in man.
1. This study was undertaken to examine changes of excitatory drive to the triceps surae alpha-motoneuron pool during fatiguing submaximal isometric contractions in man. Eight healthy subjects maintained isometric plantar flexions at 30 percent of maximum voluntary contraction (MVC) until the limit of endurance (range, 6-9 min). 2. Excitability of the alpha-