Sudden Exercise Poses Heart Risk for Sedentary People

    If you don't exercise regularly（有规律的）, a sudden bout¹ of energetic activity can trigger a heart attack, and may even kill you, according to a new study published in JAMA, the journal of the American Medical Association.
    It sounds like the scene from a movie: a flabby, out-of-shape guy has a heart attack while running to catch a train, or maybe he drops dead while having sex. Now, there's some scientific evidence to support that fictional² scenario³.
    Researchers at Tufts University near Boston combined the results of 14 studies that looked at the link between what they call episodic physical activity and heart attack and other cardiac events.
    Regular exercise may be beneficial, but co-author Jessica Paulus says that among more sedentary people, there was a short-term（短期的） increase in the danger.
    "There's a link between episodic physical activity and sexual activity with the risk of heart attack and death from sudden cardiac events," she says. "During a very short window of time along the order of one to two hours following physical activity and sexual activity and sexual activity."The researchers found that the episodic physical activity roughly tripled the risk of heart attack, but because a sudden burst of activity is rather uncommon⁴ among otherwise-sedentary people, the risk of having a heart attack while running to catch a train is actually small.
    And lead author Issa Dahabreh says regular physical activity can reduce the risk. "Individuals who exercise regularly while involved in these activities overall experience a much smaller increase in their risk of having a heart attack."Even regular exercise just once a week can significantly reduce the risk. The researchers found that a person's risk of heart attack decreased by almost half, and the risk of sudden death dropped by about one-third, for every weekly exercise session.(本文由在线英语听力室整理编辑)

1 bout   

n.侵袭，发作；一次(阵，回)；拳击等比赛

参考例句：

• I was suffering with a bout of nerves.我感到一阵紧张。
• That bout of pneumonia enfeebled her.那次肺炎的发作使她虚弱了。

2 fictional   

adj.小说的，虚构的

参考例句：

• The names of the shops are entirely fictional.那些商店的名字完全是虚构的。
• The two authors represent the opposite poles of fictional genius.这两位作者代表了天才小说家两个极端。

3 scenario   

n.剧本，脚本；概要

参考例句：

• But the birth scenario is not completely accurate.然而分娩脚本并非完全准确的。
• This is a totally different scenario.这是完全不同的剧本。

4 uncommon   

adj.罕见的，非凡的，不平常的

参考例句：

• Such attitudes were not at all uncommon thirty years ago.这些看法在30年前很常见。
• Phil has uncommon intelligence.菲尔智力超群。