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Related Experiment Videos

Increased vulnerability to eccentric exercise-induced dysfunction and muscle injury after concentric training

L L Ploutz-Snyder1, P A Tesch, G A Dudley

  • 1Department of Exercise Science, Syracuse University, NY 13244, USA.

Archives of Physical Medicine and Rehabilitation
|January 24, 1998
PubMed
Summary

Concentric-only training makes muscles more vulnerable to eccentric exercise damage. This leads to greater muscle injury and slower recovery after eccentric workouts.

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Area of Science:

  • Exercise Physiology
  • Muscle Physiology
  • Sports Medicine

Background:

  • Eccentric (ECC) exercise can induce muscle damage and dysfunction.
  • Concentric (CON)-only resistance training is a common training method.
  • The effects of CON-only training on ECC-induced muscle vulnerability are not fully understood.

Purpose of the Study:

  • To investigate whether concentric (CON)-only resistance training increases muscle vulnerability to eccentric (ECC) exercise-induced dysfunction and injury.

Main Methods:

  • A before-after trial was conducted with nine untrained men.
  • Participants underwent nine weeks of CON-only training of the quadriceps femoris (QF).
  • Post-training, participants performed ECC actions with a load equivalent to 85% of their post-training CON 1-repetition maximum (1RM).
Keywords:
Non-programmatic

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Main Results:

  • ECC exercise reduced CON 1RM by ~30% in the trained limb and 16% in the untrained limb.
  • Strength recovery was slower in the trained limb (incomplete after 10 days) compared to the untrained limb (recovered by day 8).
  • Magnetic resonance imaging (MRI) revealed a greater area of muscle injury in the trained limb, with similar injury intensity but more widespread damage.

Conclusions:

  • CON-only training appears to increase vulnerability to ECC exercise-induced muscle dysfunction and injury.
  • This increased vulnerability may be due to a higher CON 1RM, leading to greater ECC loading potential.
  • Individuals undergoing CON-only training may be at higher risk for muscle damage from subsequent ECC exercise.