跑马拉松可能会对肾产生损害

Marathons can be bad for your health, scientists have warned after a study found 80 percent of competitors suffer kidney injury because of dehydration¹. , ,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 ² recovered within two days, their findings raise questions concerning the potential long-term impact at a time when marathons are increasing in popularity. , ,The findings were published by the American Journal of Kidney Diseases, as thousands of people prepare for next month's London Marathon. , ,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. , ,A team of researchers led by Professor Chirag Parikh, of Yale University in the US, studied a small group of participants in the 2015 Hartford Marathon. , ,They collected blood and urine samples before and after the event. They analysed a variety of markers of kidney injury, including serum ³ creatinine levels, kidney cells on microscopy, and proteins in urine. , ,The researchers found that 82 percent of the runners that were studied showed Stage 1 Acute Kidney Injury (AKI) soon after the race. AKI is a condition in which the kidneys fail to filter waste from the blood. , ,Prof Parikh said: "The kidney responds to the physical stress of marathon running as if it's injured, in a way that's similar to what happens in hospitalised patients when the kidney is affected ⁴ by medical and surgical ⁵ complications." , ,The researchers stated that potential causes of the marathon-related kidney damage could be the sustained rise in core body temperature, dehydration, or decreased blood flow to the kidneys that occur during a marathon. , ,While the measured kidney injury resolved within two days of running the marathon, the researchers said the study still raises questions about the effects of repeated strenuous ⁶ activity over time, especially in warm climates.