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Results for “ELECTROMYOGRAPHY”

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At least 1,603 records · Page 89Linked to original sources
PubMed1983

A miniature electrode for surface electromyography during speech.

A miniature recessed (i.e., cup) surface EMG electrode intended for use in the perioral region during speech has been constructed and tested. In addition to its small size and low mass, a custom acrylic electrode housing features an extruded design to yield secure attachment to the skin with skin cement rather than with conventional double adhesive collars. A durable, commercially manufactured disk of homogeneous silver and silver chloride was utilized to optimize bioelectric characteristics and durability. In relation to the commonly used fine-wire intramuscular electrode composed of platinum-iridium, this surface electrode demonstrates comparable bioelectric performance in perioral applications including low, stable, and well-matched skin-electrode impedance, a low noise floor, a surprisingly wide bandwidth, and good signal-to-noise ratios.

Electromyography↗
PubMed1980

Telemetered electromyography of forelimb muscle chains in gibbons (Hylobates lar).

Electromyographic studies of brachiation in the gibbon controvert deductions, based on dissection, about the purported functions of muscle chains in the hylobatid forelimb. Neither force conduction distally along the components of the chains nor simultaneity of muscular contraction occurs in brachiation. Rather, the unique structure of the forelimb is probably the result of evolved changes in the short head of biceps brachii to enhance its role as a forearm flexor.

Action Potentials↗
PubMed1981

Cauda equina syndrome complicating ankylosing spondylitis: use of electromyography and computerised tomography in diagnosis.

A case of the cauda equina syndrome complicating ankylosing spondylitis (AS) is described. An unusual feature of this case was the relapsing and remitting nature of the condition, but there is sufficient evidence to explain the clinical picture on the basis of a recurrent intraspinal inflammatory process. The clinical and radiological features are similar to those of a further 28 reported in the literature. An electromyogram (EMG) proved important in defining the extent of neurological involvement. Computerised tomography (CT) showed marked laminar erosion and no bony exit foramen encroachment. We believe that the clinical diagnosis of this condition can be adequately confirmed with plain radiology, EMG, and CT scan.

Aged↗
PubMed1985

Physiotherapy and electromyography in muscle cramp.

Four cases of muscle cramps, at a sports institute, are presented. Electric activity was increased in cramp due to overload. The influence of stretching, electro- and compression therapies on these increased Electromyographic (EMG) activities was studied. The registration was performed with an EMG-analyser combined with a recorder, using surface electrodes.

Adult↗
PubMed1991

Relation between electromyography and anal manometry of the external anal sphincter.

Thirteen patients with faecal incontinence and 26 control subjects were studied to investigate whether a quantitative electromyographic (EMG) signal could be correlated to anal manometry. Three different electrodes were used--a concentric needle electrode, a disposable sponge electrode, and a hard anal plug electrode. The maximum amplitude of the EMG recording was used as a quantitative parameter. Linear regression showed significant correlation between EMG and anal manometry with the sponge electrode, both at rest and during squeeze. Significant correlation was also found with the concentric needle electrode during squeeze but not at rest. No correlation was found with the hard anal plug electrode either during squeeze or at rest. Reproducibility studies using the sponge electrode showed acceptable day to day variation. In conclusion, quantitative EMG recordings from a disposable sponge electrode placed in the anal canal correlate well to anal manometry and may be used for assessment of sphincter function, but the hard anal plug electrode cannot be recommended.

Adult↗
PubMed1972

Quantitative electromyography: a new analogue technique for detecting changes in action potential duration.

An automatic method using an analogue analyser is described for obtaining an index which is based on the mean phase duration of an EMG signal. This method gives similar values for motor unit action potential duration to an alternative digital method of analysis based on the distribution of time intervals between zero crossings of the EMG signal. The analysis has been found to give good discrimination of normal and myopathic EMG signals.

Action Potentials↗
PubMed1975

Safety factor in single human motor end-plates studied in vivo with single fibre electromyography.

In a single fibre EMG investigation on healthy subjects the relationship between the neuromuscular jitter and the safety factor of the motor end-plate relative to curare was studied. A positive correlation was found between the jitter increase after a standard dose of D-tubocurarine and the initial jitter. The conclusion was drawn that the neuromuscular jitter can be used as an indicator of the safety factor. There are a number of nerve-muscle disorders in which the jitter is increased, probably indicating a reduced safety factor which may be of clinical importance when these patients are subjected to diseases or drugs which would otherwise not produce neuromuscular symptomatology.

Adult↗
PubMed1975

Regional curare for the reduction of the safety factor in human motor end-plates studied with single fibre electromyography.

A method employing six minutes of regional curarization with 0.5 mg D-tubocurarine and single fibre electromyographic measurements (SFEMG) was used in order to study the effect of an additional small dose of D-tubocurarine. The effect of the additional dose was most pronounced in terms of increased jitter, on motor end-plates with the initially highest jitter. The combination of regional curarization and SFEMG jitter recordings offers a sensitive technique for detecting mild effects of various drugs on neuromuscular transmission not detectable with decrement investigations.

Action Potentials↗