The surface mechanomyogram as a tool to describe the influence of fatigue on biceps brachii motor unit activation strategy. Historical ... View Full Text


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Article Info

DATE

2003-08-16

AUTHORS

Claudio Orizio, Massimiliano Gobbo, Bertrand Diemont, Fabio Esposito, Arsenio Veicsteinas

ABSTRACT

The surface mechanomyogram (MMG) (detectable at the muscle surface as MMG by accelerometers, piezoelectric contact sensors or other transducers) is the summation of the activity of single motor units (MUs). Each MU contribution is related to the pressure waves generated by the active muscle fibres. The first part of this article will review briefly the results obtained by our group studying the possible role of motor unit recruitment and firing rate in determining the characteristics of the MMG during stimulated and voluntary contractions. The second part of this article will study the MMG and EMG during a short isometric force ramp from 0 to 90% of the maximal voluntary contraction (MVC) in fresh and fatigued biceps brachii. The aim is to verify whether changes in motor unit activation strategy in voluntarily fatigued muscle could be specifically reflected in the time and frequency domain parameters of the MMG. MMG-RMS vs. %MVC: at fatigue the MMG-RMS did not present the well known increment, when effort level increases, followed by a clear decrement at near-maximal contraction levels. MMG-MF vs. %MVC: compared to fresh muscle the fatigued biceps brachii showed an MF trend significantly shifted towards lower values and the steeper MF increment, from 65 to 85% MVC, was not present. The alteration in the MMG and EMG parameters vs. %MVC relationships at fatigue seems to be related to the impossibility of recruiting fast, but more fatigable MUs, and to the lowering of the global MUs firing during the short isometric force ramp investigated. More... »

PAGES

326-336

References to SciGraph publications

  • 1989-01. The fatigability of two agonistic muscles in human isometric voluntary submaximal contraction: an EMG study in EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY
  • 2000-02. Motor unit synchronization in young and elderly adults in EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY
  • 1987-05. Motor unit activity and surface electromyogram power spectrum during increasing force of contraction in EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY
  • 1993-03. Myo-electric fatigue manifestations revisited: power spectrum, conduction velocity, and amplitude of human elbow flexor muscles during isolated and repetitive endurance contractions at 30% maximal voluntary contraction in EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY
  • 1989-03. Muscular sound and force relationship during isometric contraction in man in EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY
  • 1998-08. Mechanomyogram from the different heads of the quadriceps muscle during incremental knee extension in EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY
  • 1992-01. Muscle sound and electromyogram spectrum analysis during exhausting contractions in man in EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY
  • 1995-03. Phonomyogram from single motor units during voluntary isometric contraction in EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY
  • 1999-07. Relationship between mechanomyogram and force during voluntary contractions reinvestigated using spectral decomposition in EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY
  • 1990-12. The influence of an increase in the level of force on the EMG power spectrum of elbow extensors in EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY
  • 2000-11. Mechanomyograms recorded during evoked contractions of single motor units in the rat medial gastrocnemius muscle in EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY
  • 2001-02. Mechanomyogram and force relationship during voluntary isometric ramp contractions of the biceps brachii muscle in EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY
  • 1998-10. Electromyogram and mechanomyogram changes in fresh and fatigued muscle during sustained contraction in men in EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY
  • 1993-10. Motor unit recruitment during prolonged isometric contractions in EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY
  • Identifiers

    URI

    http://scigraph.springernature.com/pub.10.1007/s00421-003-0924-1

    DOI

    http://dx.doi.org/10.1007/s00421-003-0924-1

    DIMENSIONS

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    PUBMED

    https://www.ncbi.nlm.nih.gov/pubmed/12923643


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