体重指数增加的男性尚可发生不育

旧金山国立周围身体健康社会科学深入研究员进行的一项深入研究挖掘出，与短时间极高血压的成人来得，极高血压基准提极高的成人早产不太可能更大。

Markku Sallmen就任于芬兰正职卫生深入研究员。他感叹：“数据库显示，成人极高血压每提极高20磅（约9公斤），早产的不太可能将提极高10%。”极高血压基准是由人的极高血压和胸围数值；还有的数据库，对大多数人，极高血压基准可成为身体极高血压的准确测试方法，也常被用来前列腺癌极高血压超重。

深入深入研究对工商业卫生深入研究构想中注册的前妻进行了深入研究。这项始于1993年的构想借此是为了检测受到影响工商业的社区地主及其全家人有益的心理因素。

国立周围身体健康社会科学深入研究员的药理学家Donna Baird麻省理工学院感叹：“与极高血压短时间的女童来得，超重或极高血压的女童较易怀孕，但是或多或不及原因的成人是否存有生子问题并未有人深入研究。”这项结果刊登在2006年9翌年《药理学杂志》上。

早产和极高血压基准的数据库资料来源于1468位地主和他们的妻子在登记确立这项深入研究时启动的民意调查。后者启动全家人有益调查表，之外前妻的生子两书，前者报告全家人极高血压和胸围的调查表。深入研究分析限于登记注册4年前急于生子及女方平均年龄低于40的前妻。

深入深入研究将这些前妻分为早产三组和可育三组，超过1年并未受孕者归为早产三组，在1年底受孕者归为可孕三组。大多数成人和异性恋平均年龄超过30岁，28%的前妻有早产症状。

深入深入研究挖掘出成人的极高血压基准是早产症的实质上危险心理因素。深入研究员调整了其它受到影响生子力的心理因素，如异性恋的极高极高血压基准、平均年龄、吸烟者、饮酒、暴露于杀虫剂，调整过后，随着极高血压基准的提极高，早产呈圆形标量提极高，在极高血压成人，早产率提极高1倍。深入深入研究还挖掘出无论平均年龄大小不一，成人的极高血压基准都是早产症的危险心理因素。

虽然没有频率的数据库，但据所述超重的成人较极高血压短时间的成人最不及不及，从而受到影响了生子。然而，关于胚胎特性的深入研究挖掘出超重和极高血压的成人，胚胎精确度较低，激素不平衡。

国立周围身体健康社会科学深入研究员的副院长Did A. Schwartz麻省理工学院感叹：“这项深入研究提出了某些与极高血压有关的另外的有益问题，抑制作用极高血压可有助于成人身体有益，其中就之外他们的受精卵有益。”该深入研究员还提出了一项新的策略性的构想——“周围环境社会科学和进化有益的新21世纪”，这项构想将于下次5翌年实施，借此在于利用周围身体健康社会科学有助于公众了解营养不良的发病原因并有助于进化有益。

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.来源于

编辑：蓝色幻想

编辑： 张靖