少量、适度的慢跑对健康更有益
[font=Verdana, Arial, Tahoma][size=14px][b]Scientists studied more than 1,000 healthy joggers and non-joggers over a 12-year period.[/b][/size][/font][font=Verdana, Arial, Tahoma][size=14px][b]科学家们对1000多名身体健康的慢跑者和不跑步的人进行研究，追踪时间超过12年。[/b][/size][/font]
[font=Verdana, Arial, Tahoma][size=14px]Those who jogged at a steady pace for less than two and a half hours a week were least likely to die in this time.[/size][/font]
[font=Verdana, Arial, Tahoma][size=14px]But those who ran more than four hours a week or did no [url=http://www.enread.com/science/99720.html]exercise[/url] had the highest death rates.[/size][/font]
[font=Verdana, Arial, Tahoma][size=14px][b]'Upper limit'[/b][/size][/font]
[font=Verdana, Arial, Tahoma][size=14px]Analysing questionnaires filled out by all the people in the Danish study, scientists concluded the ideal pace was about 5mph (8km/h) and that it was best to jog no more than three times a week or for 2.5 hours in total.[/size][/font]
[font=Verdana, Arial, Tahoma][size=14px]People who jogged more intensively - particularly those who jogged more than three times a week or at a pace of more than 7mph - were as likely to die as those who did no exercise.[/size][/font]
[font=Verdana, Arial, Tahoma][size=14px]Researcher Jacob Louis Marott, from the Frederiksberg Hospital in Copenhagen, said: "You don't actually have to do that much to have a good impact on your [url=http://www.enread.com/science/99720.html]health[/url].[/size][/font]
[font=Verdana, Arial, Tahoma][size=14px]"And perhaps you shouldn't actually do too much.[/size][/font]
[font=Verdana, Arial, Tahoma][size=14px]"No exercise recommendations across the globe mention an upper limit for safe exercise, but perhaps there is one."[/size][/font]
[font=Verdana, Arial, Tahoma][size=14px]Scientists are not yet sure what is behind this trend - but they say changes to the heart during extreme exercise could contribute. [/size][/font]
[font=Verdana, Arial, Tahoma][size=14px][b]'Brisk walking'[/b][/size][/font]
[font=Verdana, Arial, Tahoma][size=14px]In their report, they suggest: "Long-term [url=http://dict.qsbdc.com/strenuous][b]strenuous[/b][/url] endurance exercise may induce pathological [url=http://dict.qsbdc.com/structural][b]structural[/b][/url] [url=http://dict.qsbdc.com/remodelling][b]remodelling[/b][/url] of the heart and [url=http://dict.qsbdc.com/arteries][b]arteries[/b][/url]."[/size][/font]
[font=Verdana, Arial, Tahoma][size=14px]Maureen Talbot, senior cardiac nurse at the British Heart Foundation, said: "This study shows that you don't have to run marathons to keep your heart healthy.[/size][/font]
[font=Verdana, Arial, Tahoma][size=14px]"Light and moderate jogging was found to be more beneficial than being inactive or[url=http://dict.qsbdc.com/undertaking][b] undertaking[/b][/url] strenuous jogging, possibly adding years to your [url=http://www.enread.com/science/99720.html]life[/url].[/size][/font]
[font=Verdana, Arial, Tahoma][size=14px]"National guidelines recommend we do 150 minutes of moderate-intensity activity a week.[/size][/font]
[font=Verdana, Arial, Tahoma][size=14px]"It may sound like a lot, but even brisk walking is good exercise. And if you're bit of a couch potato, this is a good place to start."[/size][/font]
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