Exercise and oxidative stress: Sources of free radicals and their impact on antioxidant systems

L. L. Ji, S. Leichtweis

Research output: Contribution to journalArticlepeer-review

70 Scopus citations


Strenuous exercise is characterized by increased oxygen consumption and the disturbance between intracellular pro-oxidant and antioxidant homeostasis. At lease three biochemical pathways (i.e., mitochondrial electron transport chain, xanthine oxidase, and polymorphoneutrophil) have been identified as potential sources of intracellular free radical generation during exercise. These deleterious reactive oxygen species pose a serious threat to the cellular antioxidant defense system, such as diminished reserves of antioxidant vitamins and glutathione. However, enzymatic and non-enzymatic antioxidants have demonstrated great versitility and adaptability in response to acute and chronic exercise. The delicate balance between pro-oxidants and antioxidants suggests that supplementation with antioxidants may be desirable for physically active individuals under certain physiological conditions by providing a larger protective margin.

Original languageEnglish (US)
Pages (from-to)91-106
Number of pages16
JournalJournal of the American Aging Association
Issue number2
StatePublished - Apr 1997


  • Antioxidants
  • Exercise
  • Free radicals
  • Oxidative stress
  • Vitamins


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