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Immune changes induced by exercise in an adverse environment

R J Shephard1

  • 1Faculty of Physical Education and Health, Toronto, ON, Canada. roy.shephard@mountain-inter.net

Canadian Journal of Physiology and Pharmacology
|December 5, 1998
PubMed
Summary
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Physical activity and environmental stressors impact immune function. Moderate levels boost immunity, while intense exposure or combined stressors can suppress it, increasing infection risk.

Area of Science:

  • Immunology
  • Environmental Health
  • Exercise Physiology

Background:

  • Physical activity and environmental stressors are known to modulate immune system components.
  • Immune function encompasses T cell and natural killer (NK) cell counts, cytokine secretion, and immunoglobulin levels.

Purpose of the Study:

  • To investigate the combined effects of physical activity and environmental stressors on immune function.
  • To understand how varying intensities of these stimuli influence immune response and susceptibility to infection.

Main Methods:

  • The study reviews existing literature on the physiological responses to physical activity and environmental stressors.
  • It analyzes changes in immune markers such as T cell counts, NK cell counts, cytokine secretion, and immunoglobulin levels.

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Main Results:

  • Light physical activity and moderate environmental stress generally stimulate immune responses.
  • Exhausting physical activity or severe environmental stress can suppress immunity, leading to temporary increased susceptibility to viral infections.
  • Combined stressors often have an additive immunosuppressive effect.

Conclusions:

  • The intensity of physical activity and environmental stress is critical in determining immune response.
  • Simultaneous exposure to intense physical activity and environmental stress can lead to significant immunosuppression.
  • Understanding these interactions is crucial for managing health and preventing infections in demanding conditions.