Immunologist Claims Excessive Exercise May Cause Health Problems

Immunologist Claims Excessive Exercise May Cause Health Problems

Too much exercise can make you at risk for infection, says Leonard H. Calabrese, head of clinical immunology at the Cleveland Clinic Foundation.

This does not mean exercise taken in moderation is harmful, says Calabrese. But maximum workouts appear to affect the immune system. After athletes in a research lab ran at top speed for three hours, there was a drop in the concentration of immune cells in their blood and a decrease in the ability of the cells to function well.

Moderate exercise seems to help people reduce the risk of colds and similar conditions. A study involving 36 women who walked rapidly for 45 minutes five times a week had about half the number of colds and flu compared with non-exercising women.

The problem, says Calabrese, is that science has not yet learned how much exercise is too much and how little is too little.

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