Does exercise really boost the immune system? To test this
scientifically, the American College of Sports Medicine conducted two
studies with young and elderly women to determine whether those who
exercise get fewer colds than those who don't. In both studies, women in
the exercise groups walked briskly 35 to 45 minutes, 5 days a week, for
12 to 15 weeks, while the control groups remained physically inactive.
The walkers experienced about half the days with cold symptoms as the sedentary group.
Other research has shown that during moderate exercise,
several positive changes occur in the immune system. Although the
immune system returns to pre-exercise levels very quickly after the
exercise session, each session represents a boost that appears to reduce
the risk of infection over the long term.
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