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Related Experiment Videos

Electrical activity and soreness in muscles after exercise.

C B Berry1, T Moritani, H Tolson

  • 1Department of Physical Education, Winston-Salem State University, North Carolina 27110.

American Journal of Physical Medicine & Rehabilitation
|April 1, 1990
PubMed
Summary

Eccentric contractions cause greater quadriceps muscle soreness and require increased electrical activity for force production compared to concentric contractions. This study examined muscle electrical signals and soreness for 48 hours post-exercise.

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Area of Science:

  • Exercise Physiology
  • Biomedical Engineering
  • Muscle Physiology

Background:

  • Muscle contractions are classified as eccentric (lengthening) or concentric (shortening).
  • Eccentric exercise is known to induce greater muscle damage and soreness than concentric exercise.
  • Understanding the electrical activity changes post-exercise is crucial for recovery and performance.

Purpose of the Study:

  • To investigate the electrical activity and soreness in quadriceps muscles following eccentric (EC) and concentric contraction (CC) exercise.
  • To analyze the amplitude and frequency characteristics of the myoelectrical signal post-exercise.
  • To determine the relationship between electrical signals and perceived muscle soreness.

Main Methods:

  • Participants performed a 15-minute step test involving both EC and CC of the quadriceps.

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  • Surface electromyography (EMG) measured root mean square EMG (rmsEMG) and mean power frequency.
  • Muscle soreness was assessed using a subjective pain rating scale over 48 hours.

    • Main Results:

    • Eccentrically exercised muscles reported soreness from 12 to 48 hours post-exercise, while concentrically exercised muscles reported minimal discomfort.
    • A significant difference in rmsEMG was observed between EC and CC at 1 and 12 hours post-exercise (P < 0.05).
    • Increased electrical activity (rmsEMG) was required to achieve pre-exercise contraction levels after EC.

    Conclusions:

    • Eccentric exercise leads to prolonged muscle soreness and altered neuromuscular electrical activity.
    • Quadriceps muscles require greater electrical activation following eccentric contractions to maintain force output.
    • These findings highlight the distinct physiological responses to different contraction types and inform recovery strategies.