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Related Experiment Videos

Shift of peak torque angle after eccentric exercise.

S S Yeung1, E W Yeung

  • 1Department of Rehabilitation Sciences, Hong Kong Polytechnic University, Hong Kong, Hong Kong.

International Journal of Sports Medicine
|July 7, 2007
PubMed
Summary
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Submaximal eccentric exercise shifted the quadriceps angle-torque relationship to longer muscle lengths without reducing peak torque. Concentric exercise did not induce these changes, though eccentric exercise caused greater muscle soreness.

Area of Science:

  • Exercise Physiology
  • Muscle Mechanics
  • Biomechanics

Background:

  • Muscle contractions are classified as concentric (shortening), eccentric (lengthening), or isometric (static).
  • Eccentric contractions are known to induce greater muscle damage and soreness compared to concentric contractions.
  • Understanding the specific effects of submaximal eccentric exercise on muscle mechanical properties is crucial for training and rehabilitation.

Purpose of the Study:

  • To investigate changes in quadriceps muscle mechanical properties after a submaximal concentric-eccentric stepping exercise protocol.
  • To compare the effects of eccentric versus concentric contractions on muscle function and soreness.
  • To determine if submaximal eccentric exercise alters the angle-torque relationship of the quadriceps muscle.

Main Methods:

Related Experiment Videos

  • Twenty-four healthy, untrained subjects performed a 10-minute stepping exercise.
  • The dominant leg performed eccentric contractions, while the non-dominant leg performed concentric contractions.
  • Quadriceps isokinetic peak torque, peak torque angle, and muscle soreness were measured at baseline, immediately post-exercise, and at 1 and 2 days post-exercise.

Main Results:

  • No significant changes in peak torque were observed for either eccentric or concentric exercise.
  • A significant shift in the peak torque angle to longer muscle lengths was found in the eccentrically-exercised leg post-exercise.
  • Eccentric exercise resulted in significantly higher muscle soreness at 1 and 2 days post-exercise compared to concentric exercise.

Conclusions:

  • Submaximal eccentric exercise can alter muscle properties, specifically shifting the angle-torque relationship towards longer muscle lengths.
  • These changes occur without a significant deficit in peak muscle force production.
  • Eccentric exercise elicits a greater delayed onset muscle soreness response compared to concentric exercise following a submaximal protocol.