Research: Cycling--or any regular exercise--in old age prevents the immune system from declining - BBC News

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They followed 125 long-distance cyclists, some now in their 80s, and found they had the immune systems of 20-year-olds.

Prof Norman Lazarus, 82, of King's College London, who took part in and co-authored the research, said: "If exercise was a pill, everyone would be taking it.

"It has wide-ranging benefits for the body, the mind, for our muscles and our immune system." . . .

"Because the cyclists have the immune system of a 20-year-old rather than a 70- or 80-year-old, it means they have added protection against all these issues." . . .

They found that the endurance cyclists were producing the same level of T-cells as adults in their 20s, whereas a group of inactive older adults were producing very few.

The researchers believe that being physically active in old age will help people respond better to vaccines, and so be better protected against infections such as flu.

Steve Harridge, co-author and professor of physiology at King's College London, said: "Being sedentary goes against evolution because humans are designed to be physically active.

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