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Relation between differences in electromyographic adaptations during static contractions and the muscle function.

V Hermans1, A J Spaepen, M Wouters

  • 1Laboratory of Ergonomics and Occupational Biomechanics, Faculty of Physical Education and Physiotherapy, Katholieke Universiteit Leuven, Belgium. veerle.hermans@flok.kuleuven.ac.be

Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology
|August 7, 1999
PubMed
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This study investigated shoulder muscle activity during sustained contractions. The RMS/ACT ratio effectively distinguishes fatigue from torque changes in the deltoid and trapezius muscles.

Area of Science:

  • Biomechanics
  • Neuroscience
  • Human Movement Science

Background:

  • Electromyography (EMG) analysis is crucial for understanding muscle function.
  • Differentiating between torque production and muscle fatigue during sustained contractions is challenging.
  • Shoulder and neck muscles like the anterior deltoid and upper trapezius are vital for arm movement and posture.

Purpose of the Study:

  • To determine if EMG changes in the anterior deltoid and upper trapezius during sustained activity reflect torque variations or fatigue.
  • To evaluate the relationship between torque production and EMG parameters (RMS, ACT, MPF).
  • To assess the utility of the RMS/ACT ratio in analyzing fatigue independent of torque changes.

Main Methods:

  • Participants performed isometric arm flexion contractions at various maximal voluntary contraction (MVC) levels (20-100%).

Related Experiment Videos

  • A sustained contraction at 20% MVC was conducted to the point of endurance.
  • EMG signals were analyzed for Root Mean Square (RMS), Activity (ACT), and Mean Power Frequency (MPF).

    • Main Results:

    • EMG amplitude (RMS) strongly correlated with torque production for both deltoid and trapezius muscles.
    • MPF showed no significant difference with increasing torque but decreased more in the deltoid during endurance.
    • The RMS/ACT ratio correlated highly with MPF and proved significant in differentiating fatigue effects, especially in the trapezius.

    Conclusions:

    • EMG amplitude changes are primarily linked to torque production, not fatigue, in these shoulder muscles.
    • The RMS/ACT ratio is a valuable indicator for analyzing muscle fatigue during sustained efforts, independent of torque.
    • Fatigue mechanisms differ between the anterior deltoid and upper trapezius, as evidenced by distinct EMG parameter changes.