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Related Experiment Videos

Exercise, caloric restriction, and systemic oxidative stress.

Pietro R Galassetti1, Dan Nemet, Andria Pescatello

  • 1University of California Irvine School of Medicine, Irvine, CA, USA. pgalasse@uci.edu

Journal of Investigative Medicine : the Official Publication of the American Federation for Clinical Research
|February 14, 2006
PubMed
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Intense exercise training reduced oxidative stress markers in healthy men, regardless of calorie intake. This suggests exercise may intrinsically lower oxidation, independent of diet.

Area of Science:

  • Exercise physiology
  • Oxidative stress research
  • Human metabolism

Background:

  • Reactive oxygen species (ROS) cause oxidative stress, originating from mitochondria and neutrophils.
  • Circulating antioxidants protect against oxidative stress.
  • Exercise and diet influence ROS and antioxidants, but their combined effects are unclear.

Purpose of the Study:

  • To investigate if intense exercise training reduces systemic oxidation independently of circulating antioxidants and neutrophil-derived enzymes.
  • To examine the combined effects of exercise and caloric intake on oxidative stress markers.

Main Methods:

  • Nineteen healthy men underwent 7 days of intense exercise (3 hours/day at 75% VO2 max).
  • Participants were assigned to high-calorie (110% expenditure) or low-calorie (75% expenditure) diets.

Related Experiment Videos

  • Blood samples were analyzed for F2-isoprostanes, catalase, myeloperoxidase (MPO), interleukin-x (IL-x), and white blood cells (WBCs).

    • Main Results:

    • Serum F2-isoprostanes, a marker of lipid peroxidation, significantly decreased in both high- and low-calorie groups post-exercise.
    • Interleukin-x (IL-x) concentrations also reduced similarly in both groups.
    • No significant changes were observed in catalase levels; WBC and neutrophil counts decreased only in the low-calorie group.

    Conclusions:

    • Intense exercise training can rapidly reduce systemic oxidation in young men, irrespective of caloric intake.
    • The observed reduction in oxidation appears to be an intrinsic effect of exercise.
    • Further research is needed to clarify the roles of circulating antioxidants and neutrophil-derived enzymes.