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This Catalyst article looks at how exercise affects our immunity and susceptibility to infection. Recent research indicates that a person's level of physical activity affects their immune function, influencing their risk of respiratory tract infections such as a cold. Whereas moderate levels of regular exercise seem to reduce our susceptibility to illness, long hard bouts of exercise and periods of intensified training appear to have the opposite effect, and put athletes at increased risk of colds and flu.

The article explores this research further and looks directly at the effects exercise has on the immune system.

The article is from Catalyst: Secondary Science Review 2012, Volume 22, Issue 4.

Catalyst is a science magazine for students aged 14-19 years. Annual subscriptions to print copies of the magazine can be purchased from Mindsets.

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