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Related Experiment Videos

Effect of eccentric exercise on plasma enzyme activities previously elevated by eccentric exercise

K Nosaka1, P M Clarkson

  • 1Institute of Sports Medicine, Yokohama City University, Japan.

European Journal of Applied Physiology and Occupational Physiology
|January 1, 1994
PubMed
Summary
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A second bout of eccentric exercise reduced plasma creatine kinase (CK) and glutamic-oxaloacetic transaminase (GOT) enzyme responses. This indicates that elevated initial enzyme activities diminish the body's biochemical response to subsequent exercise.

Area of Science:

  • Exercise Physiology
  • Biochemistry
  • Sports Medicine

Background:

  • Eccentric exercise can cause muscle damage, leading to elevated plasma creatine kinase (CK) and glutamic-oxaloacetic transaminase (GOT) activities.
  • The effect of repeated eccentric exercise bouts on these biochemical markers is not fully understood.

Purpose of the Study:

  • To investigate if plasma CK and GOT activities, elevated by an initial eccentric exercise bout, are affected by a second bout of eccentric exercise.
  • To determine if the timing between exercise bouts influences the enzyme response.

Main Methods:

  • 26 male students performed one or two bouts of maximal eccentric actions of forearm flexors.
  • Plasma CK and GOT activities, muscle soreness, and force were measured before and after exercise.

Related Experiment Videos

  • A second bout was performed 3 or 5 days after the first.

    • Main Results:

    • Maximal isometric force, range of motion, circumference, and soreness showed significant changes post-exercise, with no differences between the first and second bouts.
    • Increases in plasma CK and GOT activities after the second bout were significantly smaller than after the first bout.
    • This diminished response occurred regardless of the 3- or 5-day interval between exercise bouts.

    Conclusions:

    • Repeated eccentric exercise leads to a diminished plasma CK and GOT response.
    • Elevated initial blood enzyme activities appear to reduce the biochemical markers' sensitivity to subsequent exercise stimuli.
    • The findings suggest an adaptation or altered physiological response to repeated muscle stress.