CoChat
Sign Up
Cited by 70Muscle activation and electromyography studiesMotor Control and AdaptationMechanics and Biomechanics Studies

Comparison of electromyogram spectra with force spectra during human elbow tremor.

Open access
Matthews, P B, Muir, R B·1980·The Journal of Physiology
DOI 10.1113/jphysiol.1980.sp013254PMC PMC1282859
Open this paper in CoChat — free account

Abstract

1. The tremor that develops when the elbow is flexed against a spring attached at the wrist has been analysed by determining the 'power' spectrum of the demodulated surface e.m.g. recorded from two of the active muscles, biceps and brachioradialis. This was compared with the corresponding force spectrum obtained by analysis of the force developed at the fixed end of the spring (normally one of stiffness 2.8 N/mm); this force is directly proportional to the movement at the wrist. 2. When the subject was maintaining a high target force (100-160 N), with the aid of a visual display, the tremor was large with a large sharply tuned peak in the force spectrum and there was a clear peak at the same frequency in the e.m.g. spectrum. The coherence (gamma) between the force peak and the corresponding e.m.g. peak typically had a value of 0.95 or above, indicating a high degree of correlation. 3. On developing the same target force against a rigid restraint (70 N/mm) the peak in the force spectrum was absent or very much smaller and less sharply tuned. More particularly, the tremor-related peak seen in the e.m.g. spectrum under compliant conditions was no longer present under rigid conditions. 4. At low target forces (20-40 N) with compliant loading there was a small peak in the force spectrum but no peak could be detected in the e.m.g. spectrum. With increasing target force the mechanical tremor increased considerably and a peak progressively emerged from above the background level in the e.m.g. spectrum, accompanied by the development of a corresponding peak in the coherence spectrum. Thus the difference in detectability of peaks in the e.m.g. and force spectra might simply result from differences in the background 'noise' level of the two types of spectra. 5. Changing the spring stiffness in the range 0.7-12.5 N/mm altered the frequency of the mechanically recorded tremor by 1.5-2 Hz and the peak in the e.m.g. spectrum shifted in approximate correspondence. 6. The findings support the view that the tremor seen with compliant loading of the arm is due to the stretch reflex. In addition, this work should help define the conditions under which spectral analysis of the gross e.m.g. is of practical utility.

Integrity signals

Registry

Crossref · 10.1113/jphysiol.1980.sp013254

Cites

7 of 7 references verified0 citation errors · 0 not checkable

Statistics

Recomputing p-values needs the paper’s full text.

Claims the paper makes

We couldn’t retrieve this paper’s full text, so its claims and self-check weren’t run. The registry and citation checks still apply.

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

  • Changes in tremor frequencies with alteration of mechanical conditions have also been obtained for human elbow tremor when subjects with compliant loading exert constant force against springs of different stiffness: both tremor and EMG spectra showed a shift towards higher frequencies with increasing spring stiffness.

    “Changes in tremor frequencies with alteration of mechanical conditions have also been obtained for human elbow tremor when subjects with compliant loading exert constant force against springs of different stiffness: both tremor and EMG spectra showed a shift towards higher frequencies with increasing spring stiffness.”

    From Differential effects of changes in mechanical limb properties on physiological and pathological tremor (1987) · cites this paper as [11]

Cites

Flagged first, then by citations

Cited by

Sorted by citations

Related

Authors
Matthews, P. B., & Muir, R. B.
ORCID
Matthews, P B
Venue
The Journal of Physiology
Publisher
Wiley
Published
1980-05
Volume
302
Issue
1
Pages
427-441
ISSN
  • 0022-3751 (ISSN-L)
  • 1469-7793
DOI
10.1113/jphysiol.1980.sp013254
PMC
PMC1282859
OpenAlex
W1581408389
Cited by
70
References
7
Citations by year
2024: 1 · 2021: 1 · 2018: 1 · 2016: 1 · 2014: 4 · 2013: 2 · 2012: 1
FWCI
6.16
Type
journal article
Language
en
Open access
Licence
onlinelibrary.wiley.com/termsAndConditions#vor (vor)
Locations
  • The Journal of Physiology (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Physical Sciences › Engineering › Biomedical Engineering › Muscle activation and electromyography studies
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Motor Control and Adaptation
  • Physical Sciences › Engineering › Biomedical Engineering › Mechanics and Biomechanics Studies
Keywords
force spectrum, stretch reflex, biceps brachii, brachioradialis, spring stiffness, coherence analysis
MeSH terms
Adolescent, Adult, Biomechanical Phenomena, Elbow Joint, Electromyography, Female, Humans, Male, Middle Aged, Muscles, Tremor

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

Are you an author, or do you see a problem with this page? Request a review