Even small amounts of exercise can change a person's DNA, according to a study published Wednesday by researchers at the Karolinska Institute in Stockholm, Sweden. The study examined muscle cell samples from relatively sedentary men and women before and after a short but intense workout on a stationary bike. Although the subject's underlying genetic code did not change, more genes were activated in the post-exercise cell samples. These genes are known to be significant for muscles to adapt to exercise. The researchers said caffeine also produces a similar result, but not at a high enough level to replace exercise.
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