Journal ArticleDOI
Simulation Techniques in Electromyography
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TLDR
Results indicate that SFEMG recordings from a normal MU contain mainly the AP's of the closest one to three muscle fibers of the MU, and the amplitude and area of simulated macro-EMG MUAP's increase with the number of muscle fibers in the MU.Abstract:
A motor unit action potential (MUAP) recorded in clinical electromyography (EMG) is the spatial and temporal summation of the action potentials (AP's) from all muscle fibers in a motor unit (MU) An important determinant of MUAP waveform characteristics is the size of the recording electrode In this paper, we have described the use of a modified line source model of single muscle fiber action potentials to simulate MUAP's as recorded by single fiber (SF) EMG, concentric needle (CN) EMG, and macro-EMG electrodes Results indicate that SFEMG recordings from a normal MU contain mainly the AP's of the closest one to three muscle fibers of the MU The amplitude, area, and duration of the simulated CNEMG MUAP's are determined mainly by the number and size of muscle fibers within a semicircular territory of 05, 15, and 25 mm, respectively, around the tip of the electrode The amplitude and area of simulated macro-EMG MUAP's increase with the number of muscle fibers in the MUread more
Citations
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Journal ArticleDOI
Detection of motor unit action potentials with surface electrodes: influence of electrode size and spacing
TL;DR: A computational procedure, based on the notion of isopotential layers, was developed which substantially reduced the calculation time required to estimate motor unit action potentials.
Journal ArticleDOI
EMG signal decomposition: how can it be accomplished and used?
TL;DR: Techniques exist for the decomposition of an EMG signal into its constituent components and the fundamental composition of EMG signals is explained and after, potential sources of information from and various uses of decomposed EMg signals are described.
Journal ArticleDOI
Surface EMG models: properties and applications.
TL;DR: An attempt is made to integrate the 'question level' and the 'model property level' in a matrix providing direction to the development and application of sEMG models with different characteristics and varying complexity.
Journal ArticleDOI
Volume conduction models for surface EMG; confrontation with measurements.
TL;DR: Five different models are confronted with measured MUP distributions over the skin surface above the m.
Journal ArticleDOI
Finite limb dimensions and finite muscle length in a model for the generation of electromyographic signals.
TL;DR: A volume conductor model is presented in which the aspects of finite volume conductor dimensions and finite muscle fiber length are combined and is found to be capable of generating surface MUAPs which show a very good resemblance with measured surfaceMUAPs.
References
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Journal Article
Intra- and extracellular potential fields of active nerve and muscle fibres : a physico-mathematical analysis of different models
Journal ArticleDOI
Macro EMG in healthy subjects of different ages.
Erik Stålberg,P R Fawcett +1 more
TL;DR: The findings of the recently developed technique of Macro EMG in healthy subjects of different ages suggest an increase in size of the Macro motor unit potential was found with age, particularly after the age of 60 years.
Journal ArticleDOI
Conduction velocity and amplitude of the action potential as related to circumference in the isolated fibre of frog muscle.
TL;DR: The findings with respect to conduction velocity and amplitude as a function of circumference are interpreted to indicate that the specific electrical properties of the membrane differ according to fibre size.