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Related Experiment Videos

Damage to human muscle from eccentric exercise after training with concentric exercise

N P Whitehead1, T J Allen, D L Morgan

  • 1Department of Physiology, Monash University, Clayton, Victoria 3168, Australia.

The Journal of Physiology
|October 9, 1998
PubMed
Summary

Concentric exercise training may increase muscle susceptibility to damage from subsequent eccentric exercise. This study found that prior concentric workouts enhanced muscle injury markers after eccentric loading.

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Area of Science:

  • Exercise physiology
  • Muscle damage and repair
  • Skeletal muscle adaptation

Background:

  • Eccentric exercise is known to precondition muscles against subsequent eccentric exercise-induced damage.
  • The effects of concentric exercise on muscle susceptibility to damage are less understood.

Purpose of the Study:

  • To investigate whether concentric exercise training increases muscle susceptibility to damage from subsequent eccentric exercise.
  • To compare the effects of eccentric exercise on muscles previously trained with concentric exercise versus untrained muscles.

Main Methods:

  • Eight human subjects performed 30 minutes of daily concentric exercise on one triceps surae muscle group for 5 days.
  • Eccentric exercise was applied to both trained and untrained legs to assess muscle damage.

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  • Measurements included passive torque, angle-torque curves, muscle volume, and subjective soreness.

    • Main Results:

    • Concentric exercise training led to a small but significant increase in passive torque in the exercised muscle.
    • Eccentric exercise caused greater shifts in angle-torque curves in concentrically trained muscles, indicating increased series compliance.
    • Muscle volume increased more in the trained leg post-exercise, and while peak torque decreased and stiffness increased in both legs, there were no significant differences between them.

    Conclusions:

    • Concentric exercise training appears to increase the susceptibility of skeletal muscle to damage induced by eccentric exercise.
    • The findings suggest that the type of exercise (concentric vs. eccentric) influences muscle adaptation and its response to subsequent mechanical stress.