The study presents analytical, simulation, and experimental analyses of amplitude cancellation of motor-unit action potentials (APs) in the interference electromyogram (EMG) and its relation to the size of the spike-triggered average (STA) EMG. The amount of cancellation of motor-unit APs decreases monotonically as a function of the ratio between the root mean square (RMS) of the motor-unit AP ...

BACKGROUND Dexmedetomidine has been increasingly used as an adjunct to opioid-propofol total intravenous anesthesia (TIVA). The authors tested the hypothesis and found that clinically relevant blood levels of dexmedetomidine do not produce significant attenuation of the amplitude of transcranial electric motor-evoked potentials either independently or by interaction with propofol in a dose-depe...

INTRODUCTION This article is part of the Focus Theme of Methods of Information in Medicine on "Biosignal Interpretation: Ad-vanced Methods for Neural Signals and Images". OBJECTIVES The study discusses a technique to automatically correct for effects of electrode grid displacement across serial surface EMG measurements with high-density electrode arrays (HDsEMG). The goal is to match motor un...

1. Motor units in the first dorsal interosseus muscle of normal human subjects were recorded by needle electrodes, together with the surface electromyogram (e.m.g.). The wave form contributed by each motor unit to the surface e.m.g. was determined by signal averaging. 2. The peak-to-peak amplitude of the wave form contributed to the surface e.m.g. by a motor unit increased approximately as the ...

The neuromuscular strategies employed to compensate for fatigue-induced muscle force deficits are not clearly understood. This study utilizes surface electromyography (sEMG) together with recordings of a population of individual motor unit action potentials (MUAPs) to investigate potential compensatory alterations in motor unit (MU) behavior immediately following a sustained fatiguing contracti...

In this study, the characteristics of external anal sphincter electromyography (EAS-EMG) in patients with multiple system atrophy (MSA) were analyzed, and its value diagnosis MSA was discussed. The data 23 who underwent EAS-EMG examination between January 2019 December 2021 selected to analyze such as average duration motor unit potentials (MUPs), amplitude, satellite potentials, percentage pol...

A 14 year old boy was diagnosed as suffering from type 1 muscle fibre hypotrophy with internal nuclei. On histological examination of a biopsied muscle, there was selective hypotrophy of type 1 muscle fibre with internal nuclei, and focal degenerative changes were seen in a few type 1 fibres. The small type 1 fibres were arranged in small or large groups in one bundle. An EMG study of moderatel...

Background: The time and frequency features of motor unit action potentials (MUAPs) extracted from electromyographic (EMG) signal provide discriminative information for diagnosis and treatment of neuromuscular disorders. However, the results of conventional automatic diagnosis methods using MUAP features is not convincing yet.Objective: The main goal in designing a MUAP characterization system ...

A 58-year-old man diagnosed with stiff-person syndrome presented with increased axial muscle tone (video 1, links.lww.com/WNL/A42). A successional electromyographic video in the right rectus abdominis demonstrated a large quantity of continuous motor unit potentials at rest. One minute after administration of diazepam, motor unit potentials were extraordinarily attenuated. However, 10 minutes a...