نتایج جستجو برای: amplitude of motor unit potentials
تعداد نتایج: 21211635 فیلتر نتایج به سال:
In this paper we introduce a new method for muscle force estimation from multi-channel surface electromyograms. The method combines a motor unit twitch model with motor unit innervation pulse trains, which are estimated from multi-channel surface electromyograms. The motor unit twitches are then aligned to the innervation pulse trains and summed up to obtain the total muscle force. The method w...
(2007) Motor unit number estimation using reversible jump Markov chain Monte Carlo methods. Summary. We present an application of reversible jump Markov chain Monte Carlo (RJMCMC) from the field of neurophysiology where we seek to estimate the number of motor units within a single muscle. Such an estimate is needed for monitoring the progression of neuro-muscular diseases such as amyotrophic la...
As a consequence of a stroke, both motor control as well as motor unit (MU) characteristics may change, e.g. MU size has been reported to increase due to reinnervation [1]. The high selectivity of array surface electromyography enables the non-invasive investigation of motor unit action potentials (MUAPs). The aim of the present study was to investigate how differences between the affected an u...
Transcranial magnetic stimulation (TMS) of the primary motor cortex (M1) can excite both cortico-cortical and cortico-spinal axons resulting in TMS-evoked potentials (TEPs) and motor-evoked potentials (MEPs), respectively. Despite this remarkable difference with other cortical areas, the influence of motor output and its amplitude on TEPs is largely unknown. Here we studied TEPs resulting from ...
Cold ambient temperature conditions are known to affect muscle performance characteristics, such as force output, power, and contraction velocity [ 11. Spectral and aniplitude characteristics of electromyogram (EMG) during inuscle contraction are modulated by the cold and hot ambient temperature [2]. Voluntary control of single motor unit action potentials (MUM') is a widely used method for inv...
This paper examines the physiological mechanisms responsible for differences in the amplitude of force fluctuations between young and old adults. Because muscle force is a consequence of motor unit activity, the potential mechanisms include both motor unit properties and the behavior of motor unit populations. The force fluctuations, however, depend not only on the age of the individual but als...
examination unremarkable except for some skin changes in the previously irradiated area. Chest x ray and bone scan were normal. Myelography revealed minor posterior pro-trusion of L5/S1 disc on flexion of the back. Cerebrospinal fluid contained normal cellular constituents but elevated protein at 0-8 g/litre. Motor conduction velocities in left posterior tibial and both lateral popliteal nerves...
INTRODUCTION Neuromuscular disorders, predominantly critical illness myopathy (CIM) and critical illness polyneuropathy (CIP) occur in approximately one-third of patients in intensive care units. The aim of this study was to review the important role of electrophysiology in this setting. RESULTS In CIM, sarcolemmal inexcitability causes low amplitude compound muscle action potentials (CMAPs) ...
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