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Exercise-induced oxidative stress

H M Alessio1

  • 1Physical Education, Health and Sport Studies Department, Miami University, Oxford, OH 45056.

Medicine and Science in Sports and Exercise
|February 1, 1993
PubMed
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Exercise may increase free radical activity, but trained individuals show better tolerance. Factors like exercise type, duration, intensity, and training status influence free radical biomarkers.

Area of Science:

  • Exercise physiology
  • Biochemistry
  • Oxidative stress research

Background:

  • The relationship between exercise and free radical production remains incompletely understood.
  • Elevated oxygen consumption during physical activity is hypothesized to increase free radical activity.
  • Oxidative stress markers are influenced by various exercise parameters and individual training status.

Purpose of the Study:

  • To explore the role of exercise in free radical processes.
  • To identify methods for measuring exercise-induced free radical activity.
  • To understand how exercise characteristics and training influence oxidative stress.

Main Methods:

  • Direct measurement of free radical signals using electron spin resonance (ESR).
  • Indirect assessment of oxidative stress via biomarkers such as mitochondrial membrane damage, conjugated dienes, hydroperoxides, thiobarbituric acid reactive substances (TBARS), short chain hydrocarbons, and oxidized nucleosides.

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  • Analysis of how exercise type, duration, intensity, and training status impact these biomarkers.

    • Main Results:

    • Exercise, particularly with elevated oxygen consumption, can increase free radical activity.
    • Multiple biomarkers can be used to indirectly assess free radical activity.
    • Exercise-induced oxidative stress appears better managed by trained individuals during moderate-intensity exercise.

    Conclusions:

    • Exercise influences free radical activity, with the extent depending on exercise specifics and training.
    • Trained individuals exhibit enhanced tolerance to exercise-induced oxidative stress, especially at moderate intensities.
    • Further research is needed to fully elucidate the complex interplay between exercise and oxidative stress.