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While many
scientists agree that exercise has a positive effect on the body's
ability to resist diseases, few are certain of the nature of the
relationship. All of the variables associated with exercise and the
immune system make research design difficult and conclusive evidence
rare. Among the pieces of the puzzle independent researchers have noted
to date:
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Too
little and too much exercise may increase the risk of catching a
cold.
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Moderate
exercise has the potential to ward off a cold
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The
number of immune cells increases with exercise, but could be a
reaction for repairing exercise damaged muscle tears rather than
fighting infections.
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Acute
responses of the immune system to exercise depend on the intensity
and duration of exercise relative to the person's fitness level.
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Exercising pursued to the level of producing muscle damage can
further impair an immune system already weakened by acute
infections, HIV infection and other conditions.
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Too Much
exercise stimulates the production of free radicals, which may
impair the immune system.
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Cycling
hundreds of miles a week may lead to impaired immunity.
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