Marathons can be bad for your health, scientists have warned after a study found 80 percent of competitors suffer kidney injury because of dehydration.

科学家警告称，马拉松可能会对人体产生危害。他们的研究发现，由于缺水，百分之八十的马拉松比赛选手都患有肾功能损伤。

Researchers said that although the kidneys of the participants in the 26.2 mile race fully recovered within two days, their findings raise questions concerning the potential long-term impact at a time when marathons are increasing in popularity.

研究人员称，尽管参赛者跑完26.2英里（42公里）后，他们的肾脏两天内就能完全恢复正常，但如今马拉松比赛日渐流行，研究结果引起了人们对于马拉松长期潜在影响的担忧。

The findings were published by the American Journal of Kidney Diseases, as thousands of people prepare for next month's London Marathon.

《美国肾病杂志》刊登了这项研究成果。与此同时，上千人正摩拳擦掌，为下个月的伦敦马拉松赛做准备。

Previous research has shown that engaging in unusually vigorous activities - such as military training - in warm climates can damage the kidneys, but little is known about the effects of marathon running.

先前的研究表明，在气候温暖时参加过于剧烈的活动，如军事训练，会损害人的肾脏。但人们对马拉松所造成的影响则知之甚少。

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