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Related Experiment Videos

Intramuscular and surface electromyogram changes during muscle fatigue.

T Moritani, M Muro, A Nagata

    Journal of Applied Physiology (Bethesda, Md. : 1985)
    |April 1, 1986
    PubMed
    Summary
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    Surface electromyogram (EMG) amplitude may better reflect muscle fatigue than frequency shifts. Motor unit (MU) activity during sustained contractions shows complex changes in recruitment and firing rates affecting EMG signals.

    Area of Science:

    • Neuromuscular Physiology
    • Biomedical Engineering
    • Exercise Science

    Background:

    • Surface electromyogram (EMG) analysis is crucial for understanding muscle function.
    • Motor unit (MU) recruitment and firing frequency are key determinants of muscle force production.
    • The relationship between MU activity and surface EMG spectral properties during fatigue is complex.

    Purpose of the Study:

    • To investigate the impact of motor unit (MU) recruitment and firing frequency on surface EMG spectral analysis.
    • To differentiate EMG changes during maximal voluntary contraction (MVC) versus submaximal (50% MVC) contractions.
    • To assess the validity of surface EMG spectral shifts in reflecting underlying MU activity during fatigue.

    Main Methods:

    • Simultaneous recording of intramuscular MU spikes and surface EMG from the biceps brachii.

    Related Experiment Videos

  • Analysis using computer-aided intramuscular spike amplitude-frequency histograms.
  • Frequency power spectral analysis of surface EMG signals during sustained MVC and 50% MVC.

    • Main Results:

    • During MVC, surface EMG amplitude (rmsEMG) and mean power frequency (MPF) decreased significantly with reduced MU spike amplitude and firing frequency.
    • During 50% MVC, MPF significantly declined, but rmsEMG increased significantly, accompanied by progressive MU recruitment.
    • These findings indicate distinct patterns of MU and EMG changes between maximal and submaximal contractions.

    Conclusions:

    • Surface EMG amplitude (rmsEMG) may serve as a more reliable indicator of underlying MU activity during muscle fatigue than spectral frequency shifts.
    • Frequency power spectral shifts in surface EMG do not consistently reflect changes in MU recruitment and rate-coding patterns during fatigue.
    • Understanding these differential responses is vital for accurate interpretation of EMG during physiological and pathological conditions.