Muscular sound and force relationship during isometric contraction in man

Claudio Orizio, Renza Perini, Arsenio Veicsteinas

Research output: Contribution to journalArticle

158 Citations (Scopus)

Abstract

The contracting muscle generates a low frequency sound detectable at the belly surface, ranging from 11 to 40 Hz. To study the relationship between the muscular sound and the intensity of the contraction a sound myogram (SMG) was recorded by a contact sensor from the biceps brachii of seven young healthy males performing 4-s isometric contractions from 10% to 100% of the maximal voluntary contraction (MVC), in 10% steps. Simultaneously, the electromyogram (EMG) was recorded as an index of muscle activity. SMG and EMG were integrated by conventional methods (iSMG and iEMG). The relationship between iSMG and iEMG vs MVC% is described by parabolic functions up to 80% and 100% MVC respectively. Beyond 80% MVC the iSMG decreases, being about half of its maximal value at 100% MVC. Our results indicate that the motor unit recruitment and firing rate affect the iSMG and iEMG in the same way up to 80% MVC. From 80% to 100% MVC the high motor units' discharge rate and the muscular stiffness together limit the pressure waves generated by the dimensional changes of the active fibres. The muscular sound seems to reflect the intramuscular visco-elastic characteristics and the motor unit activation pattern of a contracting muscle.

Original languageEnglish
Pages (from-to)528-533
Number of pages6
JournalEuropean Journal of Applied Physiology and Occupational Physiology
Volume58
Issue number5
DOIs
Publication statusPublished - Mar 1989

Fingerprint

Isometric Contraction
Electromyography
Muscles
Neurophysiological Recruitment
Pressure

Keywords

  • Isometric contraction
  • Motor unit activation pattern
  • Muscle sound

ASJC Scopus subject areas

  • Public Health, Environmental and Occupational Health
  • Physiology

Cite this

Muscular sound and force relationship during isometric contraction in man. / Orizio, Claudio; Perini, Renza; Veicsteinas, Arsenio.

In: European Journal of Applied Physiology and Occupational Physiology, Vol. 58, No. 5, 03.1989, p. 528-533.

Research output: Contribution to journalArticle

Orizio, Claudio ; Perini, Renza ; Veicsteinas, Arsenio. / Muscular sound and force relationship during isometric contraction in man. In: European Journal of Applied Physiology and Occupational Physiology. 1989 ; Vol. 58, No. 5. pp. 528-533.
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