The hyperlink between train and immunity
It was previously believed that exercising hard had a negative impact on your immune system. Because there are fewer immune cells in your bloodstream after exercise, the researchers believed that the exposure to the activity led to death, increasing the risk of infection in the hours and days that followed.
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However, a recent analysis of the research published in Exercise Immunology Review found that these immune cells do not die, but move all over your body in search of invaders. The harder you train, the more immune cells are released. In the short term, this means that exercise will help your immune system destroy invaders, and in the long term, it will slow down the decline in the immune system due to aging, reducing rather than increasing your risk of infection. The real culprits for infection, according to researchers, are factors such as poor diet, stress and inadequate sleep, not exercise.