The reduced cardiovascular risk remained when the researchers from the Medical University of South Carolina took into account physical activity, body mass index, demographic and cardiac risk factors.

南卡罗来纳医学院的研究人员综合考虑了身体活动、体重指数、人口统计和心脏危险因素后认为：减少的风险依旧存在。

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They asked about the residents' level of physical activity, body mass and use of public transportation before and after the light rail.

研究者们询问了该地居民的活动量、体重以及在轻轨建成前和建成后使用公共交通的情况。

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The C.D.C.defines physical activity as anything that gets your body moving.

VOA: special.2010.06.08

Physical activity produces body heat.

VOA: special.2010.07.27

Imaging studies, body activity, sleep and other indicators reveal more and more clues.

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"We aren't sure why activity primes your body for sleep so well, but it's likely a combination of factors, including lowering your core body temperature, increasing the sleep-promoting hormone melatonin and supporting a biological need to restore energy levels and repair cells and tissues when you sleep, " Cardinal says.

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But these chemicals are a by-product of the metabolic activity that powers the body.

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