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Cited by 35Muscle activation and electromyography studiesMuscle Physiology and DisordersPeripheral Nerve Disorders

The DOI matches its Crossref record; 41 of the 41 references it cites were found in a registry or an index.

The muscle activity spectrum: spectral analysis of muscle force as an estimator of overall motor unit activity

Hömberg, V, Reiners, K, Hefter, H, Freund, H.-J·1986·Electroencephalography and Clinical Neurophysiology
DOI 10.1016/0013-4694(86)90087-8
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Abstract

Starting from the observation that the part above 6 Hz of the power spectrum of force tremor during isometric contractions can be related to the unfused twitches of motor units firing asynchronously, an attempt was made to study the usefulness of force tremor spectral analysis as a global descriptor of motoneurone pool activity. To compensate for the mechanical low-pass filter characteristic of skeletal muscle which leads to increased damping of mechanical ripples at higher frequencies, a numerical compensation rule was derived from data obtained by electrical microstimulation of small ensembles of motor units (MUs). Hidden line plots of consecutive partially overlapping spectra allowed visualization of changes in spectral composition during ongoing muscle activity. The resulting muscle activity spectra (MAS) showed broad peaks according to the range of onset firing rates in normal subjects. These tended to shift to higher frequencies with increasing force. Under conditions with increased synchronization of the MUs these broad peaks were replaced by sharp peaks corresponding to the burst repetition rate. Patients with different motor dysfunctions were selected to illustrate how alterations of MU activity are reflected in the MAS. Decreased or increased firing rates were observed as well as abnormal states of synchronization. It is concluded that the MAS provides useful information about some aspects of the discharge characteristics of ensembles of MUs and therefore represents a method to monitor some qualitative 'image' of the MU activities within a muscle.

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Crossref · 10.1016/0013-4694(86)90087-8

Cites

41 of 41 references verified0 citation errors · 0 not checkable

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  • This 8-12 Hz tremor corresponds in peak frequency to the isometrically recorded force tremor emerging during prolonged isometric contractions at maximal forces.

    “Furthermore this 8-12 Hz tremor corresponds in peak frequency to the isometrically recorded force tremor emerging during prolonged isometric contractions at maximal forces.2”

    From Differential effects of changes in mechanical limb properties on physiological and pathological tremor (1987) · cites this paper as [2]

Citations

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Research works printed but not linked: 3

  1. Freund, 1978, The relationship between physiological and pathological tremor, Vol. 5, 66
  2. Hömberg, 1983, Mechanical and neural factors in generation of physiological and pathological tremors, Neurosci. Lett., 170
  3. Reiners, 1985, Veränderungen des Entladungsverhaltens motorischer Einheiten bei spinalen Muskelatrophien und hereditären motorischen und sensiblen Neuropathien, Z. EEG-EMG, 16, 37

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Metadata

Authors
Hömberg, V, Reiners, K., Hefter, H., & Freund, H.-J.
Affiliations
Düsseldorf University Hospital (DE)
Corresponding author
Hömberg, V
ORCID
Venue
Electroencephalography and Clinical Neurophysiology
Publisher
Elsevier BV
Published
1986-03
Volume
63
Issue
3
Pages
209-222
ISSN
0013-4694 (ISSN-L)
DOI
10.1016/0013-4694(86)90087-8
OpenAlex
W1983154747
Cited by
35
References
41
Citations by year
2022: 1 · 2015: 1
FWCI
2.56
Type
journal article
Language
en
Open access
closed
Licence
www.elsevier.com/tdm/userlicense/1.0/ (tdm)
Locations
  • Electroencephalography and Clinical Neurophysiology (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Physical Sciences › Engineering › Biomedical Engineering › Muscle activation and electromyography studies
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Muscle Physiology and Disorders
  • Health Sciences › Medicine › Clinical Neurology › Peripheral Nerve Disorders
Keywords
motor unit activity, motor unit synchronization, motor unit firing rate
MeSH terms
Adolescent, Adult, Aged, Humans, Isometric Contraction, Middle Aged, Motor Neurons, Movement Disorders, Muscles, Spectrum Analysis

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