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VOA慢速英语(翻译+字幕+讲解):跑步前拉伸就能预防损伤?

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No Evidence Stretching Prevents Running Injuries
It is widely believed that stretching improves running performance and lowers the risk of injuries. But, a group of researchers say that belief is a myth. Instead, they say an active warm-up can help with running performance and progressive training can reduce injury risk.
The researchers are the creators of an infographic series for the British Journal of Sports Medicine. The series is designed to separate truth and myths about running.
The research team says there is evidence that stretching could help keep joints moving well. But they say it does not help, or harm, performance.
James Alexander with La Trobe University in Melbourne, Australia, is the lead writer of the series. He and his research team are physiotherapists and runners themselves.
In an email to Reuters Health, Alexander wrote that runners have some beliefs around running injury risks, injury prevention and performance that oppose current research. He added that such beliefs cause runners to continue using ineffective methods in their running training.
The team of physiotherapists work with runners of differing abilities and strengths. They discuss myths and facts about running with their patients. They created the series of five "Running Myth" infographics to inform other runners.
The latest deals with static muscle stretching -- lengthening a muscle to the point of tension for 30 seconds. Many runners falsely believe this can reduce injuries. Runners also sometimes use static stretching to reduce muscle soreness after difficult runs, but research does not support this idea either.
However, after a run, stretching can improve joint movement and help runners relax, the researchers note.
Since running puts stress on the joints and soft tissues, runners have a high risk of suffering joint pain, shin splints, and other problems. These often happen when runners too quickly increase how often, how hard, or how long they run.
The infographic suggests that runners build their performance through progressive training. It should start with an active warm-up that involves 5-10 minutes of walking or jogging. They could include 6-8 dynamic stretches. That kind of stretching moves the joints fully. Runners can do this especially in the lower parts of the body, such as doing walking lunges and leg swings. In addition, the researchers suggest ending the warm-up with three short, quick runs at the goal running speed, such as three fast 100-meter runs.
The infographic creators say that warm-ups improve running performance but are not proven to reduce injuries. Progressive training and the improved running performance itself will do that, they say.
Richard Blagrove is a lecturer and researcher at Loughborough University in the United Kingdom. He was not involved in the infographics. He said many runners stretch because joints and muscles start to feel stiff after doing many repetitive movements.
Static stretches reduce the stiff sensations in the short-term because they extend the nerves in the overworked tissues.
If runners want to do a small amount of static stretching and find that it helps them, it probably will not have a bad effect on performance or increase injury risk, he told Reuters Health by email.
But instead of doing mainly static stretching, it would be better for runners to do strength training exercises and "progress their running at a sensible rate to avoid injury."
I'm Alice Bryant.

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重点单词   查看全部解释    
sensible ['sensəbl]

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adj. 可察觉的,意识到的,实用的
n. 可

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ineffective [ini'fektiv]

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adj. 无效的,无能的,效率低的

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minutes ['minits]

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n. 会议记录,(复数)分钟

 
burst [bə:st]

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n. 破裂,阵,爆发
v. 爆裂,迸发

 
inform [in'fɔ:m]

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v. 通知,告诉,向 ... 报告,告发

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dynamic [dai'næmik]

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adj. 动态的,动力的,有活力的
n. 动力

 
current ['kʌrənt]

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n. (水、气、电)流,趋势
adj. 流通的

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tension ['tenʃən]

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n. 紧张,拉力,张力,紧张状态,[电]电压

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promptly [prɔmptli]

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adv. 敏捷地,迅速地

 
campaign [kæm'pein]

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n. 运动,活动,战役,竞选运动
v. 从事运

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