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Intense exercise and its association with diseases such as the common cold A researcher at Loma Linda University found that athletes who train twice as hard as they normally are are twice as likely to get colds and virus attacks. After researching the effects of cortisol on athletes, the researcher found that their body strength increased by 60 percent after a training session. This level of cortisol secretion reduces the immune system and reduces the body's ability to deal with harmful bact...
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