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Another research study was reported in 2007
2007年发表的另一个研究
which investigated whether leisure-time activity,
调查了女性的业余活动
body mass index, BMI or body fat distribution
身体质量指数和身体脂肪分布
influenced colon cancer risk in women.
对其患直肠癌风险的影响
The subjects of the study were enrolled
研究对象加入了
in a very large and ongoing project to follow
一个大型的进行中的项目
the lifestyle and health risks in nurses.
进而跟踪记录护士的生活方式和健康风险
This was called the nurses health study
这个研究名为护士健康研究
and involved over 80,000 women followed
从1976年起，超过8万名女性
since 1976. Every two years the women
参与了这个研究，每两年，研究对象
provided personal information on medical risk
会通过邮寄给她们的问卷
factors of major medical events through mailed
提供关于主要医疗事故的医疗风险因素的
questionnaires. The time per week spent doing
个人信息，研究对象每周
leisure time physical activities was recorded
运动的时间被记录下来
and a MET hour per week score was calculated.
并计算出每周每小时的MET值
The leisure activities included walking, jogging,
业余运动包括行走，慢跑
running, bicycling, swimming, tennis, calisthenics,
快跑，骑自行车，游泳，打网球，健美操
aerobics or rowing machines. Hospital records
有氧运动以及划船机运动
and pathology reports gave cancer incident
医院记录和病理学报告
results for the participants.
提供参与者的癌症发病结果
The study found that having a high BMI
研究发现身体质量指数高
significantly increased the risk of colon cancer
会显著增加女性的直肠癌风险
in women. A BMI greater than 29 was
身体质量指数大于29
considered high. The results of the study
是公认的高指数，研究结果具有说服力
were convincing that higher levels of leisure time
高强度的业余时间运动
activities was associated with decreased risk
能够降低女性
of colon cancer in women. Those women
患结肠癌的风险
who walked between 1 and 2 hours per week
每周行走1到2小时的女性
lowered colon cancer risk by 31%.
会使结肠癌的发病率降低31%
A further protective effect of exercise
每周超过4小时
was observed in women who participated
进行中度或剧烈运动的女性
in more than 4 hours per week of moderate
有更好的防癌效果
or vigorous physical activity. This reduced
她们的结肠癌发病率降低了44%
their risk by 44%. The intensity of the activity
所以，运动强度对预防结肠癌
therefore was important to the protective effect.
效果的好坏至关重要
