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Exercise, free radical generation, and aging

R A Fielding1, M Meydani

  • 1Department of Health Sciences, Boston University, MA 02215, USA.

Aging (Milan, Italy)
|February 1, 1997
PubMed
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Aging reduces muscle mass and exercise capacity, increasing oxidative stress. While older adults have more antioxidants, exercise may further boost them, potentially increasing the need for antioxidant vitamins.

Area of Science:

  • Gerontology
  • Exercise Physiology
  • Biochemistry

Background:

  • Advancing age leads to significant declines in skeletal muscle mass (approx. 6% per decade after 30), impacting metabolism and aerobic capacity.
  • Exercise dramatically increases oxygen consumption (10-fold), elevating reactive oxygen species (ROS) production.
  • Older adults may be more vulnerable to exercise-induced oxidative damage due to age-related physiological changes.

Purpose of the Study:

  • To investigate the impact of aging on body composition and exercise capacity.
  • To examine the relationship between exercise, reactive oxygen species (ROS), and antioxidant enzyme expression in aging.
  • To determine if regular exercise in older adults influences antioxidant status and requirements.

Main Methods:

Related Experiment Videos

  • Analysis of age-related changes in skeletal muscle mass and body composition.
  • Assessment of exercise-induced oxygen consumption and reactive oxygen species (ROS) generation.
  • Evaluation of antioxidant enzyme expression and activity in response to exercise training in aging populations.

    • Main Results:

    • Skeletal muscle mass decline with age affects basal energy needs and maximal exercise capacity.
    • Exercise increases ROS production, potentially exacerbating oxidative stress in older individuals.
    • Aging is linked to increased antioxidant enzymes, but the effect of exercise training on their upregulation remains debated.

    Conclusions:

    • Aging significantly alters body composition and reduces exercise capacity, increasing susceptibility to oxidative stress.
    • The role of exercise in modulating antioxidant defenses in older adults requires further investigation.
    • Older individuals engaging in regular exercise might have elevated antioxidant vitamin requirements to counteract potential deficits.