伦敦（路透社）报道，本周一有研究称，每天锻炼一小时，可以降低肠癌风险。
此研究由“欧洲癌症与营养前瞻性研究”的科研人员发表，包括了10个欧洲国家413000人。分析了体力活动对结肠癌的影响后发现，不论是在公园慢跑，还是举重或者游泳，即使是打扫房间，或两个小时的轻体力劳动也会起作用。活动强度最大的人群结肠癌风险下降22%。右结肠癌的风险下降更明显，为35%。锻炼使正常体重人群癌症风险下降影响最大，对超重人群影响程度稍小，对直肠癌无效。
结肠直肠癌是发达国家最常见的癌症。据IARC称，每年约有94万新诊断病例，492000人死于此病。健康专家估计，约有70%的病例是可以通过改变饮食及锻炼来预防的。
研究组带头人、法国里昂国际癌症研究署（IARC）Christine Friedenreich博士称，这项研究样本量大，研究了欧洲国家各种不同水平的体力活动，可以更深入分析体力活动如何影响肠癌风险。
EPIC协调员、伦敦皇家学院教授Elio Riboli也说，这个研究中包含的研究样本量大，并发现了结肠的不同部位及直肠癌症发病风险不同，这很有意义。
Hour of daily exercise cuts bowel cancer risk
LONDON (Reuters) - Whether is it jogging around the park, pumping iron or swimming, an hour of vigorous exercise a day can lower the risk of bowel cancer, a study said on Monday.
Even cleaning the house, or two hours of less strenuous activity can make a difference, according to the study of more than 413,000 people in 10 European countries.
"This study is significant because of its very large sample size and the different levels of activity that were observed across the European countries," said Dr Christine Friedenreich, lead author of the research, from the International Agency for Research on Cancer (IARC) in Lyon, France.
"This allowed a more in-depth analysis of how physical activity influences colon cancer risk," she added.
The research was published by scientists working for the European Prospective Investigation into Cancer and Nutrition (EPIC), which was designed to investigate the relationships between diet, nutrition, lifestyle and environmental factors and cancer.
A team of international scientists analyzed the impact of physical activity on the risk of colon cancer and found people with the highest levels of exercise were 22 percent less likely to develop it. The reduced risk was higher, up to 35 percent, for tumors on the right side of the colon.
Although exercise had the biggest impact in cutting cancer risk in people of normal weight, it was also beneficial to a lesser extent in men and women who were overweight or obese.
But exercise did not have a protective effect against rectal cancer.
Colon and rectal are among the most common cancers in developed countries. More than 940,000 cases are diagnosed each year and about 492,000 people die from the illness, according to IARC.
Health experts estimate about 70 percent of cases could be prevented by changes in diet and exercise.
Professor Elio Riboli, the coordinator of EPIC from Imperial College London, said the large number of people included in the research was important.
"We were particularly interested in the results that we found for different parts of the colon and rectum which were not feasible in previous studies because of the smaller sample sizes and lack of data on the position of the tumors," he said in a statement
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