体重指数增加的男性易引发不育

American国立交通安全生物科学分析所进行的一项分析辨认出，与但会运动量的成人相比，运动量百分比上升的成人早产可能性更大。

Markku Sallmen就职于芬兰职业卫生分析所。他说道：“数据显示，成人运动量每上升20磅（约9公斤），早产的可能性将上升10%。”运动量百分比是由人的运动量和身材高大计算得来的数据，对大多数人，运动量百分比可成为身体成年人的可靠举例来说，也常以被用来筛查运动量以致于。

学术界对农牧业卫生分析计划书之前注册的侄女进行了分析。这项发端1993年的计划书借以是为了检查影响农牧业社区地主及其家人心理健康的诱因。

国立交通安全生物科学分析所的流行病学家Donna Baird助手说道：“与运动量但会的男士相比，以致于或成年人的男士不易怀孕，但是同样情况的成人是否存在不孕问题尚未有人分析。”这项结果发表在2006年9同月《流行病学杂志》上。

早产和运动量百分比的有系统出自于1468位地主和他们的妻子在登记纳入这项分析时完成的调查结果。后者完成家人心理健康调查表，仅限于侄女的不孕史，前者报告家人运动量和身材高大的调查表。分析分析限于非盈利性4年前打算不孕及女方年龄低于40的侄女。

学术界将这些侄女分为早产组和可育组，超过1年未卵子者归为早产组，在1周内卵子者归为可孕组。大多数成人和男同性恋年龄超过30岁，28%的侄女有早产症状。

学术界辨认出成人的运动量百分比是早产症的分立脆弱诱因。分析员修正了其它影响不孕力的诱因，如男同性恋的高运动量百分比、年龄、吸烟、饮酒、暴露于杀虫剂，修正过后，随着运动量百分比的上升，早产长方形线性上升，在成年人成人，早产率上升1倍。学术界还辨认出无论年龄大小，成人的运动量百分比都是早产症的脆弱诱因。

虽然没有人频率的数据，但据据信以致于的成人较运动量但会的成人次数少，从而影响了不孕。然而，关于胚胎特性的分析辨认出以致于和成年人的成人，胚胎质量较高，激素不平衡。

国立交通安全生物科学分析所的副所长Did A. Schwartz助手说道：“这项分析指出了某些与成年人有关的另外的心理健康问题，抑制成年人可加强成人身体心理健康，其之前就仅限于他们的卵子心理健康。”该分析所还指出了一项新的战略性的计划书——“状况生物科学和有机体心理健康的新前沿”，这项计划书将于明年5同月实施，借以在于利用交通安全生物科学加强公众了解疾病的确诊原因并加强有机体心理健康。

Men with increased body mass index (BMI) were significantly more likely to be infertile than normal-weight men, according to research conducted at the National Institute of Environmental Health Sciences (NIEHS), one of the National Institutes of Health."The data suggest that a 20-pound increase in men's weight may increase the chance of infertility by about 10 percent," says Markku Sallmen, lead author on the paper who is now at the Finnish Institute of Occupational Health. BMI is a number calculated from a person's weight and height. BMI provides a reliable indicator of body fatness for most people and is used to screen for weight categories that may lead to health problems.The researchers studied couples enrolled in the Agricultural Health Study (AHS), a large project that began in 1993 examining factors that impact the health of farmers and their families in agricultural communities. "Women who are overweight or obese tend to he a more difficult time becoming pregnant than normal-weight women, but whether men who are overweight or obese also he fertility problems had not been studied," says Donna Baird, Ph.D., an NIEHS epidemiologist with the study. The study is published in the September 2006 issue of Epidemiology.The data on infertility and body mass came from questionnaires that 1,468 farmers and their wives completed when they enrolled in the study. The wives completed a family health questionnaire, which included information about the couple's reproductive history. The men reported their weight and height on a questionnaire about their health. The ysis was limited to couples with a pregnancy attempt during the four years before enrollment, and to women under the age of 40. The researchers divided the couples into infertile and fertile groups. The infertile couples were those that tried for longer than a year to conceive, and the fertile couples were those that conceived within a year. The majority of men and women were more than 30 years old. Twenty-eight percent of the couples had experienced infertility.Researchers found that men's BMI was an independent risk factor for infertility. The researchers adjusted for other factors that could affect fertility, including high BMI of the woman, age, cigarette smoking, alcohol intake, and solvent and pesticide exposure. After adjustment, there was a general increase in infertility with increased BMI, reaching a nearly 2-fold increase among obese men. When researchers divided the sample into two equal groups by men's age, they found that men's BMI was a risk factor for infertility in both the older and younger men.The researchers did not he data on frequency of sexual intercourse, so it is possible that overweight men he less sexual intercourse than their normal weight counterparts and this could influence fertility. However, there he been recent studies looking at semen characteristics that show lower semen quality for overweight and obese men, as well as hormonal differences."This study provides data on some additional health problems associated with obesity," said Did A. Schwartz, M.D., director of the National Institute of Environmental Health Sciences. "Preventing obesity can help improve men's overall health, perhaps even their reproductive health."The NIEHS unveiled a new strategic plan, "New Frontiers in Environmental Sciences and Human Health," in May aimed at challenging and energizing the scientific community to use environmental health sciences to understand the causes of disease and to improve human health.出自于

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