2015年6月29日voa英语听力

【www.guakaob.com--英语听力】

href=http://www.51test.net/yytl/ target=_blank>英语听力频

道。

Extreme Exercise Can Poison the Blood
极限运动会毒害血液
If you're serious about fitness, you know the importance of training your muscles and your brain. Without the right prep, you won't have the physical or mental endurance to finish, whether it's a five-k or an Ironman. But it turns out that it may be just as important to train your gut—or suffer inflammatory consequences. So says a study in the International Journal of Sports Medicine.
如果你真的很在意健康，那你就该知道锻炼肌肉以及大脑有多重要。如果没有做好准备，不管是生理上还是心理上你都没有足够的耐力去完成挑战——不管是五项全能赛还是铁人赛。但事实证明，训练内脏同样也很重要——不然就会遭受炎症的折磨。《国际运动医学杂志》上的一项研究如是说。
\Researchers sampled the blood of 17 runners before and after a 24-hour ultramarathon—where runners covered anywhere from 75 to 130 miles on foot. During the race, their guts got leaky—due to a lack of blood flow to the intestines, and the physical trauma from so many jarring miles. Gut bacteria escaped into the blood, where some released toxins. The runners' bodies then responded by launching an immune response, and inflammation set in.
研究人员分别在17位运动员参加24小时超长马拉松之前和之后对他们进行了血样采集。超长马拉松即运动员在任一地点跑步跑够75到130英里。在长跑过程中，由于缺乏流向肠道的血液，以及如此长距离的剧烈运动带来的物理创伤，有些运动员的内脏出现渗漏。进而肠道细菌混进血液里，有些还释放了毒素。然后运动员的身体启动免疫反应，从而患上炎症。
Some runners actually had blood profiles identical to those of patients admitted to the hospital with blood poisoning, or sepsis.
有些运动员甚至与那些因罹患血中毒或败血症而住进医院的病人拥有相同的血液指标。
But the most well-trained competitors avoided the problem. Their bodies launched a counterattack, unleashing anti-inflammatory compounds to tamp down their bodies' immune overreaction.
但大部分受过良好训练的参赛选手并没有出现这些问题。他们的身体发起了反攻，释放出抗炎化合物压制身体里的免疫反应过度。
The authors say just four hours of activity is extreme enough to kick off this chain of inflammation. Suggesting it's key to gradually build up to new personal bests, even if they're not ultra worthy. As has long been said: slow and steady wins t

本文来源：http://www.guakaob.com/yingyuziyuan/2271.html