WASHINGTON ? A sedentary lifestyle can amplify a genetic disposition to obesity, but just walking briskly, and briefly, each day can cut that effect in half, a new study shows.
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"This is the first study that directly looked at the effect of the sedentary behavior of television watching on the body mass index (BMI) of individuals with a genetic predisposition to obesity," said study author Qibin Qi authors at a conference by the American Heart Association this week in San Diego.
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To combat the results, Qi said a one-hour daily walk "reduced the genetic influence towards obesity, measured by differences in BMI by half."
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The study involved 7,740 women and 4,564 men, with researchers collecting data on their physical activity and TV watching two years prior to assessing their BMI.
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The average American watches television for about four to six hours each day, noted Qi.
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The BMI indicator is the ratio of weight in kilograms (pounds) to square of height in meters (inches) ? on this scale, a score of 30 or more is considered obese.
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The genetic effect on BMI was seen as "more pronounced in people who spent 40 hours a week watching television than those who spent an hour or less, 0.34 versus 0.08 kg/m2," according to the study
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The recommended walking exercise was associated with 0.06 kg/m2 reduction in the genetic effect on BMI, said researchers, who presented their report at the American Heart Association's Epidemiology and Prevention/Nutrition, Physical Activity and Metabolism 2012 Scientific Sessions conference in San Diego.
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Source: http://www.mnn.com/health/fitness-well-being/stories/sedentary-life-amplifies-obesity-genes
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