Electromyography and clinical neurophysiology
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The effects of parallel versus perpendicular electrode orientations on EMG amplitude and mean power frequency from the biceps brachii.
The purposes of this study were threefold: (1) to compare the isometric torque-related patterns of absolute and normalized electromyographic (EMG) amplitude and mean power frequency (MPF) responses for electrode orientations that were parallel and perpendicular to the muscle fibers; (2) to examine t...
Electromyographic study of stomatognathic system muscles during chewing of different materials.
The aim of this study was to compare the behavior of the major chewing muscles (anterior temporalis, masseter and suprahyoid muscles) by using two commercial chewing gums (A and B) and two insipid materials (cotton ball and Parafilm M) through analysis of electromyographic signals. Ten female young...
Activation pattern masticatory muscles in dysphonics woman.
PROPOSE: To evaluate the pattern of activation of the masticatory muscles in dysphonic women. Seventeen women was divided into two groups: experimental group with 10 dysphonic women (33.6 +/- 8.0) and control group with 7 healthy women (25 +/- 5,19). The Electromyography exam of the left (LM) and ri...
Influence of trunk muscle co-contraction on spinal curvature during sitting reclining against the backrest of a chair.
Today, many office workers frequently adopt a relaxed or slumped sitting posture for many hours, and often people tend to spend their leisure time reclining against the backrest of a chair while sitting for a long time, as when watching television. While sitting, the pelvis rotates backwardly, and l...
Changes in ulnar nerve conduction velocity across the elbow in different angles of elbow flexion.
The goal of this study is to determine the changes in motor and sensory nerve conduction velocity (NCV) of ulnar nerve at elbow area in different angles of elbow flexion and also to define the optimum angle at which there is an ideal correlation between the across elbow and below elbow NCVs of ulnar...
The effects of external support on electromechanical delay of the peroneus longus muscle.
We examined the time lag between the onset of electrical activity in the peroneus longus muscle and a change in force as detected by the force platform. Five trials were completed for each condition and a repeated measures ANOVA was used to determine statistical significance. The results showed no s...
Influence of the surface EMG electrode on the compound muscle action potential.
The recording characteristics of surface EMG electrodes were investigated. Compound muscle action potential (CMAP) and surface recorded motor unit action potentials were recorded from different muscles, using different surface electrode shapes and sizes. The CMAP was smaller for larger surface elect...
Down beat nystagmus in vitamin B 12 deficiency syndrome.
A 34 years old male, presenting with progressive proximal weakness, with a neurogenic pattern on needle EMG, and a family history suggestive of an autosomal recessive disorder, was found to have additional features of myeloneuropathy and a down beat nystagmus. A low serum vitamin B12 level was found...
Levetiracetam induced polyneuropathy: a case report.
We report the first case of polyneuropathy induced by levetiracetam, an anti-epileptic medication. Follow up electrodiagnostic studies showed significant improvement after discontinuation of the medication.
The usefulness of the blink reflex in the early diagnosis of cranial nerve neuropathy associated with diabetes mellitus.
I and type II and of more than or less than 10 years duration. The BR was elicited by stimulation the supraorbital nerve using the Dantec Neuromatic 2000M machine. The latency of the components response recorded as R1, R2y (ipsilateral) and R2c (contralateral). A direct response was achieved by the...