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Tuesday, August 4, 2020 | History

4 edition of Interval pattern of single motor units found in the catalog.

Interval pattern of single motor units

Steen Andreassen

Interval pattern of single motor units

by Steen Andreassen

  • 353 Want to read
  • 17 Currently reading

Published by Institute of Electronic Systems, Aalborg University Centre : distributed by Aalborg University Press in Aalborg .
Written in English

    Subjects:
  • Myoneural junction.,
  • Action potentials (Electrophysiology) -- Mathematical models.,
  • Electromyography -- Mathematical models.

  • Edition Notes

    Statementby Steen Andreassen.
    SeriesSeries in biomedical engineering ;, no. 1
    Classifications
    LC ClassificationsQP369.5 .A5
    The Physical Object
    Pagination219 p. :
    Number of Pages219
    ID Numbers
    Open LibraryOL4492451M
    ISBN 108773070092
    LC Control Number79322364
    OCLC/WorldCa6016187

      Fig. 1. The structure of the neural code. (A) Flexible microelectrode arrays (Inset) were used to record single motor units in the EXP.A sample recording shows (Lower) a well-isolated single motor unit (spikes marked by asterisks) and (Upper) the corresponding instantaneous and trial-averaged pressures (red and black, respectively).(B) To identify the temporal scale of precision of spike Cited by:   The interference pattern is dependent on the shape of the individual motor unit potentials (eg, amplitude, duration, polyphasia), the firing rates, and the number of active units.

    Motor units were recruited over an interval starting from contraction onset (range: 22– ms). Upon recruitment, discharge rates declined from an initial rate (range: 89– pulses per second), with varying likelihood of doublet (interspike interval of 3 ms; range: 0–50%).Author: Jakob Lund Dideriksen, Alessandro Del Vecchio, Dario Farina.   Motor Unit Potential (MUP) recruitment is seen here. Beginning with a single, repeating motor unit (first recruited) and then viewing the second unit to activate. Recruitment interval .

    Functional divergence of human genioglossus motor units with respiratory-related activity. S. Tsuiki, T. Ono, Y. Ishiwata, T. Kuroda. #ERS Journals Ltd ABSTRACT: The genioglossus muscle has at least two types of motor unit with respiratory-related activity. Inspiratory motor units Cited by:   INTRODUCTION. The basic functional unit of the neuromuscular system is the motor unit, which is defined as being an α-motoneuron and all the muscle fibres that it innervates (Sherrington, ).The metabolic and mechanical properties of motor units have been extensively researched and a number of classification systems have been developed based on physiology (Burke et al., ), Cited by:


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Interval pattern of single motor units by Steen Andreassen Download PDF EPUB FB2

The normal control of force in the anterior tibial muscle was reflected by a fast regulation of the interval pattern of single motor units. Short and long intervals alternated, the correlation between successive intervals was negative and "double discharges" were present.

The discharge rate at 60% of maximal effort was at most 20 by: regulation of the interval pattern of single motor units. Short and long intervals alternated, the correlation between successive intervals was negative and "double discharges" were present.

Thedischarge rate at 60%ofmaximal effort was at most20Hz. Asthe development ofselective electrodes hasmade it possible to record action potentials from singleCited by: Download PDF: Sorry, we are unable to provide the full text but you may find it at the following location(s): (external link)Author: Steen Andreassen.

Study of single motor unit (SMU) activity during rapid isotonic contractions, such as those characterizing speech, provide a closer look at the inacessible central mechanisms responsible for the encoding of the speech motor program.

This study represents a quantification of the discharge and recruitment patterns of SMU's in the anterior belly of digastric, a muscle active in bringing about jaw Author: H.

Sussman, R. Powers, P. MacNeilage. JournalofNeurology, Neurosurgery, andPsychiatry,39, Dischargepattern ofsingle motorunits in the tonic vibration reflex ofhumantriceps surae DAVID BURKE' AND HANS H. SCHILLER2 From the Department of Clinical Neurophysiology, AcademicHospital, Uppsala, Sweden SYNOPSIS Using a single fibre EMGelectrode the firing pattern of 46 motor units in the triceps surae has been Cited by:   Normal recruitment pattern.

(A) With minimal effort of muscle contraction, a single motor unit is seen firing at 6 Hz. The time between 2 discharges is approximately milliseconds (ms. wasseen in five units when high intensities ofstimulation were used. The intervals between the two discharges was the same as the intervals between peaks in the PSTH.

Surface EMGresponses in the FDImuscle behaved in a waypredietable from the behaviour ofthe single motor units Cited by: B. the response of single muscle fibers to a single action potential input.

a motor unit firing pattern that is rarely observed under normal physiological conditions. an excessive contraction that results in the fusing of muscle fibers. a muscle firing pattern resulting from one's willing a muscle to contract at maximum velocity.

the response of single muscle fibers to a single action potential input. a sustained maximal contraction due to intense motor unit firing.

an excessive contraction. The standard deviation was low and independent of the mean interval. A negative correlation between adjacent intervals was found. Thus during a short contraction, usual for femoris (this muscle being rather a fast one), the second pattern of activity was typical, while during an unusual, prolonged contraction the first pattern was by: Recruitment and discharge patterns of single motor units (MUs) in the anterior belly of digastric were studied during speech in three subjects, using electrodes facilitating selective recording at high force levels.

Fixed recruitment order was observed in over 99% of all by: 9. Interspike interval distributions from human motor units of a variety of muscles were analysed to assess the role of synaptic noise in excitation. The time course of the underlying post-spike after-hyperpolarization (AHP) was deduced by applying a specially developed transform to the interval by: One pattern (regular) was composed of a train of stimuli with constant interpulse intervals, set at x the twitch contraction time of each unit (interval range, 27‐51 ms), and delivered for (or ) ms.

For the total (FF + FI) motor‐unit sample, the mean (+/‐ S.D.) stimulation frequency was 26 +/‐ 4 Cited by: Changes in single motor unit behaviour contribute to the increase in contraction speed after dynamic training in humans.

J Physiol –, Crossref PubMed ISI Google Scholar; Westad C, Mork PJ, Westgaard RH. Firing patterns of low-threshold trapezius motor units in feedback-controlled contractions and vocational motor by: 3.

A motor unit is made up of a motor neuron and the skeletal muscle fibers innervated by that motor neuron's axonal terminals. Groups of motor units often work together to coordinate the contractions of a single muscle; all of the motor units within a muscle are considered a motor pool. The concept was proposed by Charles Scott Sherrington.

All muscle fibers in a motor unit are of the same fiber type. When a motor. These results contrast with those of Zajac and Young12, who found a monotonically increasing sequence of intervals to be optimal for single motor units.

The use of on-line averaging and computation of the integral for whole muscle tension (rather than single motor units) increased the flexibility and accuracy in our by:   The effects of irregularity in the pattern of stimulation on the tension produced by motor units in the rat medial gastrocnemius muscle were investigated.

The effects of decreasing as well as increasing the interpulse intervals were observed for each motor unit in tetani fused to different degrees. For each motor-unit type, it was found that the effects of these changes depended on the Cited by: In this study, the training effects of static and dynamic exercise programs on the firing patterns of single motor units (SMU) in the human tibialis anterior muscle were investigated.

In a six week program, the static group (N=5) participated in daily high intensity, short duration, isometric exercises while the dynamic group (N=5) participated three times weekly in low intensity, moderate Cited by: 2. The inter-pulse intervals between adjacent motor unit action potentials of a particular motor unit action potential train were measured and subsequently analyzed as a real continuous random variable.

interval, recordingsfrom single motor units patients withspasticity. Thesolidlines in AandB regression lines determined from 97 recordings single motor units in 4normalsubjects. A statistical analysis of the firing pattern of single motor units in the human brachial biceps muscle is presented.

Single motor unit spike trains are recorded and analyzed. The statistical treatment of these spike trains is as stochastic point processes, the theory of which is briefly discussed.Single unit pattern: A single motor unit fires at rapid rate during maximum voluntary effort.

An incomplete interference pattern typically signifies a decreased number of MUAPs being activated with maximal effort. This may be suggestive of a neurogenic lesion resulting in a decreased number of functional motor units.By Steve McCaw. Each muscle in the body includes many motor units. A motor unit consists of a group of individual muscle fibers that are activated by a single motor neuron.

When stimulated by an action potential transmitted along the motor neuron, all the fibers in a motor unit develop muscle tension (a pulling force) at the same time.