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Surface EMG modifications after eccentric exercise.

F Felici1, L Colace, P Sbriccoli

  • 1Institute of Human Physiology, Faculty of Medicine, Università di Roma 'La Sapienza', Rome, Italy; I.R.C.C.S. Rehabilitation Hospital, S. Lucia, Rome, Italy.

Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology
|August 20, 2010
PubMed
Summary
This summary is machine-generated.

Surface electromyographic (sEMG) median frequency (MDF) changes detect muscle damage after eccentric contractions (EC). MDF is a sensitive, non-invasive tool for early detection of exercise-induced muscle alterations.

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Area of Science:

  • Exercise Physiology
  • Biomedical Engineering
  • Muscle Physiology

Background:

  • Eccentric contractions (EC) can induce muscle damage.
  • Assessing muscle damage non-invasively is crucial for understanding exercise responses.
  • Surface electromyography (sEMG) offers potential for monitoring muscle changes.

Purpose of the Study:

  • To investigate if sEMG signals change significantly after EC, indicating muscle damage.
  • To evaluate the sensitivity of sEMG parameters (RMS, MDF) to EC-induced muscle alterations.
  • To determine if MDF can serve as an early, non-invasive marker for muscle damage.

Main Methods:

  • Six sedentary adults underwent EC of the biceps brachii.
  • sEMG signals were recorded during isometric contractions (80% and 50% MVC).
  • Root mean square (RMS) and median frequency (MDF) were analyzed; MVC and creatine kinase levels were also measured.

Main Results:

  • Spectral parameters, particularly MDF, were more sensitive to EC-induced sEMG changes than RMS.
  • A significant shift in MDF towards lower frequencies occurred 1 hour post-EC.
  • MDF changes correlated with the progression of muscle damage, suggesting it reflects fiber damage, potentially type 2B.

Conclusions:

  • Median frequency (MDF) of sEMG is a suitable parameter for early, non-invasive detection of muscle damage following eccentric contractions (EC).
  • MDF's sensitivity and correlation with muscle damage evolution make it valuable for monitoring exercise-induced effects.
  • Findings suggest EC-induced modifications involve selective damage to type 2B muscle fibers.