Cited by 208Muscle activation and electromyography studiesMuscle Physiology and DisordersPeripheral Nerve Disorders

Acoustic myography: A noninvasive monitor of motor unit fatigue

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Barry, Daniel T., Geiringer, Steven R., Ball, Richard D.·1985·Muscle & Nerve

Abstract

Acoustic myography is the recording of sounds produced by contracting muscle. These sounds become louder with increasing force of contraction. We have compared muscle sounds with surface EMG to monitor the dissociation of electrical from mechanical events (presumably, the loss of excitation–contraction coupling) which occur with motor unit fatigue. Acoustic signals were amplified using a standard phonocardiograph, recorded on FM magnetic tape, and digitally analyzed. Muscles were examined at rest, with intermittent contractions, and with sustained contractions. We found that with fatigue, the acoustic amplitude decayed, but the surface EMG amplitude did not. With decreased effort, however, the acoustic and the surface EMG amplitudes declined simultaneously. By simultaneously recording acoustic signals and needle EMG, individual motor units were resolved acoustically in two muscles with decreased numbers of motor units and increased motor unit size. Fasciculations also produced acoustic signals, although no acoustic signal has yet been found that correlates with fibrillations. Analysis of acoustic signals from muscle provides a noninvasive method for monitoring motor unit fatigue in vivo. It may also be useful in distinguishing muscle fatigue from decreased volition.

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Crossref · 10.1002/mus.880080303

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  • Acoustic signals increase in parallel with surface EMG signals during voluntary and evoked contraction, but acoustic amplitude decays with fatigue whereas EMG amplitude does not.

    “Acoustic signals increase in parallel with surface EMG signals during voluntary and evoked contraction, but acoustic amplitude decays with fatigue whereas EMG amplitude does not”

    From A critical review of interfaces with the peripheral nervous system for the control of neuroprostheses and hybrid bionic systems (2005) · cites this paper as Barry et al., 1985

    The Abstract reports that acoustic amplitude decayed with fatigue while surface EMG amplitude did not, and the Figure 5 discussion describes both signals increasing together when voluntary effort increased. The copy does not establish that they increase in parallel during evoked contractions; the Discussion describes external nerve stimulation as a proposed future test. It also notes that surface EMG began to decay below 45% of maximal voluntary contraction, so the claim that EMG amplitude does not decay needs qualification. Page numbers are unavailable in our copy. (LLM, conf=0.88)

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Authors
Barry, D. T., Geiringer, S. R., & Ball, R. D.
Affiliations
University of Michigan (US)
Corresponding author
Barry, Daniel T.
Venue
Muscle & Nerve
Publisher
Wiley
Published
1985-03
Volume
8
Issue
3
Pages
189-194
ISSN
  • 0148-639X (ISSN-L)
  • 1097-4598
OpenAlex
W2096569144
Cited by
208
References
16
Citations by year
2026: 5 · 2025: 2 · 2024: 3 · 2023: 3 · 2022: 3 · 2021: 2 · 2020: 3 · 2019: 5 · 2018: 9 · 2017: 5 · 2016: 2 · 2015: 3 · 2014: 5 · 2013: 10 · 2012: 6
FWCI
3.26
Type
journal article
Language
en
Open access
Locations
  • Muscle & Nerve (publishedVersion)
  • PubMed (publishedVersion)
  • Deep Blue (University of Michigan) (submittedVersion)
Funders
University of Michigan (48109)
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 › Radiology, Nuclear Medicine and Imaging › Peripheral Nerve Disorders
Keywords
mechanomyography, motor unit fatigue, muscle sound, excitation-contraction coupling, surface electromyography, needle electromyography, sustained contraction, motor unit size, fasciculations
MeSH terms
Acoustics, Adult, Electromyography, Fatigue, Humans, Motor Neurons, Muscle Contraction, Muscles, Myography

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